Investments and Derivative Instruments (Details 3) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Available-for-Sale Securities
Cost or Amortized Cost	$ 29,226	$ 46,161
Gross Unrealized Gains	1,733	4,486
Gross Unrealized Losses	(829)	(823)
Fair Value	30,126	49,804
Non-Credit OTTI	(25)	(62)
Fixed Maturities Available-for-sale at Amortized Cost	28,838	45,753
Equity Securities Available for Sale at Cost	388	408
ABS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,202	1,807
Gross Unrealized Gains	13	38
Gross Unrealized Losses	(100)	(172)
Fair Value	1,115	1,673
Non-Credit OTTI	(3)	(4)
Collateralized Debt Obligations [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,602	2,236
Gross Unrealized Gains	112	61
Gross Unrealized Losses	(67)	(117)
Fair Value	1,643	2,160
Non-Credit OTTI	(1)	(4)
CMBS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,350	3,757
Gross Unrealized Gains	138	262
Gross Unrealized Losses	(50)	(107)
Fair Value	2,438	3,912
Non-Credit OTTI	(4)	(7)
Corporate [Member]
Available-for-Sale Securities
Cost or Amortized Cost	16,345	27,774
Gross Unrealized Gains	1,273	3,426
Gross Unrealized Losses	(270)	(221)
Fair Value	17,348	30,979
Non-Credit OTTI	(8)	(19)
Foreign Government Debt Securities [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,265	1,369
Gross Unrealized Gains	27	120
Gross Unrealized Losses	(113)	(29)
Fair Value	1,179	1,460
Non-Credit OTTI	0	0
Municipal [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,056	1,808
Gross Unrealized Gains	31	204
Gross Unrealized Losses	46	(14)
Fair Value	1,041	1,998
Non-Credit OTTI	0	0
RMBS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,659	4,590
Gross Unrealized Gains	77	196
Gross Unrealized Losses	(73)	(115)
Fair Value	2,663	4,671
Non-Credit OTTI	(9)	(28)
U.S. Treasuries [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,359	2,412
Gross Unrealized Gains	32	151
Gross Unrealized Losses	(77)	(12)
Fair Value	2,314	2,551
Non-Credit OTTI	0	0
Fixed maturities [Member]
Available-for-Sale Securities
Gross Unrealized Gains	1,703	4,458
Gross Unrealized Losses	(796)	(787)
Fair Value	29,741	49,404
Non-Credit OTTI	(25)	(62)
Equity Securities, AFS [Member]
Available-for-Sale Securities
Gross Unrealized Gains	30	28
Gross Unrealized Losses	(33)	(36)
Fair Value	385	400
Non-Credit OTTI	$ 0	$ 0