documentclass{article}
usepackage{tikz}

begin{document}

begin{tikzpicture}[scale=1]

tikzset{
noeudA/.style={
  rectangle,
  inner sep=0pt,
  text width=25mm,
  align=center,
  draw=black,
  fill=green!30,
  minimum height = 10mm
  },
noeudB/.style={
  rectangle,
  inner sep=0pt,
  text width=25mm,
  align=center,
  draw=black,
  fill=green!20,
  minimum height = 10mm
  },
noeudC/.style={
  rectangle,
  inner sep=0pt,
  text width=20mm,
  align=center,
  draw=black,
  fill=green!10,
  minimum height = 12mm
  },
noeudD/.style={
  rectangle,
  inner sep=0pt,
  text width=20mm,
  align=center,
  draw=black,
  fill=blue!10,
  minimum height = 10mm
  },
feuille/.style={
  rectangle,
  inner sep=0pt,
  text width=20mm,
  align=center,
  draw=black,
  fill=blue!10,
  minimum height = 10mm
  },
segment/.style={
 very thick
 }
}

defDistanceInterFeuilles{1.3}

defNiveauA{0}
defNiveauB{-2}
defNiveauC{-4}
defNiveauD{-6}

% Noeuds (MODIFIABLES : Styles et Coefficients d'InterFeuilles)
node[noeudA] (R) at (0,{NiveauA}) {SCR};

node[noeudB] (Ra) at (-4,{NiveauB}) {Ajustement};
node[noeudB] (Rb) at (0,{NiveauB}) {BSCR};
node[noeudB] (Rc) at (4,{NiveauB}) {Opérationnel};

node[noeudC] (Rba) at (-7.5, {NiveauC}) {Marché};
node[noeudC] (Rbb) at (-4.5, {NiveauC}) {Santé};
node[noeudC] (Rbc) at (-1.5, {NiveauC}) {Contre-partie};
node[noeudC] (Rbd) at (1.5, {NiveauC}) {Vie};
node[noeudC] (Rbe) at (4.5, {NiveauC}) {Non-vie};
node[noeudC] (Rbf) at (7.5, {NiveauC}) {Actifs incorporels};

% Noeud Marché
node[noeudD] (Rbaa) at (-8,{NiveauD - (1)*DistanceInterFeuilles}) {Taux d'intérêt};
node[noeudD] (Rbab) at (-8,{NiveauD - (2)*DistanceInterFeuilles}) {Action};
node[noeudD] (Rbac) at (-8,{NiveauD - (3)*DistanceInterFeuilles}) {Immobilier};
node[noeudD] (Rbad) at (-8,{NiveauD - (4)*DistanceInterFeuilles}) {Spread};
node[noeudD] (Rbae) at (-8,{NiveauD - (5)*DistanceInterFeuilles}) {Change};
node[noeudD] (Rbaf) at (-8,{NiveauD - (6)*DistanceInterFeuilles}) {Concen-tration};
node[noeudD] (Rbag) at (-8,{NiveauD - (7)*DistanceInterFeuilles}) {Illiquidité};

% Noeud Santé
node[noeudD] (Rbba) at (-5.5,{NiveauD}) {SLT};
node[noeudD] (Rbbaa) at (-5.5, {NiveauD - (1)*DistanceInterFeuilles -0.5}) {Mortalité};
node[noeudD] (Rbbab) at (-5.5, {NiveauD - (2)*DistanceInterFeuilles -0.5}) {Longévité};
node[noeudD] (Rbbac) at (-5.5, {NiveauD - (3)*DistanceInterFeuilles -0.5}) {Incapacité Invalidité};
node[noeudD] (Rbbad) at (-5.5, {NiveauD - (4)*DistanceInterFeuilles -0.5}) {Rachat};
node[noeudD] (Rbbae) at (-5.5,{NiveauD - (5)*DistanceInterFeuilles -0.5} ) {Dépenses };
node[noeudD] (Rbbaf) at (-5.5, {NiveauD - (6)*DistanceInterFeuilles -0.5}) {Révision};
node[noeudD] (Rbbb) at (-3.25,{NiveauD}) {Catastrophe};
node[noeudD] (Rbbc) at (-1, {NiveauD}) {NSLT};
node[noeudD] (Rbbca) at (-1, {NiveauD - (1)*DistanceInterFeuilles -0.5}) {Prime et réserve};
node[noeudD] (Rbbcb) at (-1, {NiveauD - (2)*DistanceInterFeuilles -0.5}) {Rachat};

% Noeud Vie
node[noeudD] (Rbda) at (2,{NiveauD - (1)*DistanceInterFeuilles}) {Mortalité};
node[noeudD] (Rbdb) at (2,{NiveauD - (2)*DistanceInterFeuilles}) {Longévité};
node[noeudD] (Rbdc) at (2,{NiveauD - (3)*DistanceInterFeuilles}) {Incapacité Invalidité};
node[noeudD] (Rbdd) at (2,{NiveauD - (4)*DistanceInterFeuilles}) {Rachat};
node[noeudD] (Rbde) at (2,{NiveauD - (5)*DistanceInterFeuilles}) {Dépenses};
node[noeudD] (Rbdf) at (2,{NiveauD - (6)*DistanceInterFeuilles}) {Révision};
node[noeudD] (Rbdg) at (2,{NiveauD - (7)*DistanceInterFeuilles}) {Catas-trophe};

% Noeud Non Vie
node[noeudD] (Rbea) at (4.5,{NiveauD - (1)*DistanceInterFeuilles}) {Prime et réserve};
node[noeudD] (Rbeb) at (4.5,{NiveauD - (2)*DistanceInterFeuilles}) {Rachat};
node[noeudD] (Rbec) at (4.5,{NiveauD - (3)*DistanceInterFeuilles}) {Catas-trophe};

coordinate (interm1) at (0,-1);
draw[segment] (R)-- (interm1) -| (Ra);
draw[segment] (R)--(Rb);
draw[segment] (R)-- (interm1) -| (Rc);

coordinate (interm2) at (0,-3);
draw[segment] (Rb) -- (interm2) -| (Rba);
draw[segment] (Rb)-- (interm2) -| (Rbb);
draw[segment] (Rb)-- (interm2) -| (Rbc);
draw[segment] (Rb)-- (interm2) -| (Rbd);
draw[segment] (Rb)-- (interm2) -| (Rbe);
draw[segment] (Rb)-- (interm2) -| (Rbf);

coordinate (interm3) at (-9.5,-5.5);
draw[segment] (Rba)|-(interm3);
draw[segment] (interm3)|-(Rbaa);
draw[segment] (interm3)|-(Rbab);
draw[segment] (interm3)|-(Rbac);
draw[segment] (interm3)|-(Rbad);
draw[segment] (interm3)|-(Rbae);
draw[segment] (interm3)|-(Rbaf);
draw[segment] (interm3)|-(Rbag);

coordinate (interm4) at (-4.5,-5);
draw[segment] (Rbb)-- (interm4) -| (Rbba);
draw[segment] (Rbb)-- (interm4) -| (Rbbb);
draw[segment] (Rbb)-- (interm4) -| (Rbbc);

coordinate (interm5) at (-4,-7);
draw[segment] (Rbba)|-(interm5);
draw[segment] (interm5)|-(Rbbaa);
draw[segment] (interm5)|-(Rbbab);
draw[segment] (interm5)|-(Rbbac);
draw[segment] (interm5)|-(Rbbad);
draw[segment] (interm5)|-(Rbbae);
draw[segment] (interm5)|-(Rbbaf);

coordinate (interm6) at (-2.4,-7);
draw[segment] (Rbbc)|-(interm6);
draw[segment] (interm6)|-(Rbbca);
draw[segment] (interm6)|-(Rbbcb);

coordinate (interm7) at (0.5,-5.5);
draw[segment] (Rbd)|-(interm7);
draw[segment] (interm7)|-(Rbda);
draw[segment] (interm7)|-(Rbdb);
draw[segment] (interm7)|-(Rbdc);
draw[segment] (interm7)|-(Rbdd);
draw[segment] (interm7)|-(Rbde);
draw[segment] (interm7)|-(Rbdf);
draw[segment] (interm7)|-(Rbdg);

coordinate (interm8) at (6,-5.5);
draw[segment] (Rbe)|-(interm8);
draw[segment] (interm8)|-(Rbea);
draw[segment] (interm8)|-(Rbeb);
draw[segment] (interm8)|-(Rbec);

end{tikzpicture}

end{document}