Investments and Derivative Instruments (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Available-for-Sale Securities
Cost or Amortized Cost	$ 30,013	$ 46,161
Gross Unrealized Gains	1,866	4,486
Gross Unrealized Losses	(834)	(823)
Fair Value	31,039	49,804
Non-Credit OTTI	(29)	(62)
Fixed Maturities Available-for-sale at Amortized Cost	29,627	45,753
Equity Securities Available for Sale at Cost	386	408
ABS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,313	1,807
Gross Unrealized Gains	14	38
Gross Unrealized Losses	(110)	(172)
Fair Value	1,217	1,673
Non-Credit OTTI	(4)	(4)
Collateralized Debt Obligations [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,632	2,236
Gross Unrealized Gains	112	61
Gross Unrealized Losses	(69)	(117)
Fair Value	1,669	2,160
Non-Credit OTTI	(1)	(4)
CMBS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,632	3,757
Gross Unrealized Gains	127	262
Gross Unrealized Losses	(70)	(107)
Fair Value	2,689	3,912
Non-Credit OTTI	(5)	(7)
Corporate [Member]
Available-for-Sale Securities
Cost or Amortized Cost	16,839	27,774
Gross Unrealized Gains	1,397	3,426
Gross Unrealized Losses	(265)	(221)
Fair Value	17,971	30,979
Non-Credit OTTI	(9)	(19)
Foreign Government Debt Securities [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,230	1,369
Gross Unrealized Gains	26	120
Gross Unrealized Losses	(119)	(29)
Fair Value	1,137	1,460
Non-Credit OTTI	0	0
Municipal [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,044	1,808
Gross Unrealized Gains	36	204
Gross Unrealized Losses	40	(14)
Fair Value	1,040	1,998
Non-Credit OTTI	0	0
RMBS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,783	4,590
Gross Unrealized Gains	82	196
Gross Unrealized Losses	(77)	(115)
Fair Value	2,788	4,671
Non-Credit OTTI	(10)	(28)
U.S. Treasuries [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,154	2,412
Gross Unrealized Gains	42	151
Gross Unrealized Losses	(52)	(12)
Fair Value	2,144	2,551
Non-Credit OTTI	0	0
Fixed maturities [Member]
Available-for-Sale Securities
Gross Unrealized Gains	1,836	4,458
Gross Unrealized Losses	(802)	(787)
Fair Value	30,655	49,404
Non-Credit OTTI	(29)	(62)
Equity Securities, AFS [Member]
Available-for-Sale Securities
Gross Unrealized Gains	30	28
Gross Unrealized Losses	(32)	(36)
Fair Value	384	400
Non-Credit OTTI	$ 0	$ 0