Investments and Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Available-for-Sale Securities
Cost or Amortized Cost	$ 61,200		$ 61,491
Gross Unrealized Gains	3,559	2,813
Gross Unrealized Losses	(638)	(1,077)
Available-for-sale Securities, Fair Value	64,118		63,225
Non-Credit OTTI	16		19
ABS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,274		2,404
Gross Unrealized Gains	29	25
Gross Unrealized Losses	(51)	(64)
Available-for-sale Securities, Fair Value	2,252		2,365
Non-Credit OTTI	2		2
Collateralized Debt Obligations [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,343		2,340
Gross Unrealized Gains	107	108
Gross Unrealized Losses	(53)	(59)
Available-for-sale Securities, Fair Value	2,394		2,387
Non-Credit OTTI	0		0
CMBS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	4,411		4,288
Gross Unrealized Gains	198	216
Gross Unrealized Losses	(41)	(58)
Available-for-sale Securities, Fair Value	4,568		4,446
Non-Credit OTTI	7		6
Corporate [Member]
Available-for-Sale Securities
Cost or Amortized Cost	27,037		27,013
Gross Unrealized Gains	2,211	1,823
Gross Unrealized Losses	(208)	(346)
Available-for-sale Securities, Fair Value	29,040		28,490
Non-Credit OTTI	4		7
Foreign Government Debt Securities [Member]
Available-for-Sale Securities
Cost or Amortized Cost	4,092		4,228
Gross Unrealized Gains	73	52
Gross Unrealized Losses	(115)	(176)
Available-for-sale Securities, Fair Value	4,050		4,104
Non-Credit OTTI	0		0
Municipal [Member]
Available-for-Sale Securities
Cost or Amortized Cost	12,052		11,932
Gross Unrealized Gains	688	425
Gross Unrealized Losses	(58)	(184)
Available-for-sale Securities, Fair Value	12,682		12,173
Non-Credit OTTI	0		0
RMBS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	4,515		4,639
Gross Unrealized Gains	95	90
Gross Unrealized Losses	(54)	(82)
Available-for-sale Securities, Fair Value	4,556		4,647
Non-Credit OTTI	3		4
U.S. Treasuries [Member]
Available-for-Sale Securities
Cost or Amortized Cost	3,731		3,797
Gross Unrealized Gains	86	7
Gross Unrealized Losses	(20)	(59)
Available-for-sale Securities, Fair Value	3,797		3,745
Non-Credit OTTI	0		0
Fixed maturities [Member]
Available-for-Sale Securities
Gross Unrealized Gains	3,487	2,746
Gross Unrealized Losses	(600)	(1,028)
Available-for-sale Securities, Fair Value	63,339		62,357
Non-Credit OTTI	16		19
Equity Securities, AFS [Member]
Available-for-Sale Securities
Gross Unrealized Gains	72	67
Gross Unrealized Losses	(38)	(49)
Available-for-sale Securities, Fair Value	779		868
Non-Credit OTTI	$ 0		$ 0