Investments and Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Available-for-Sale Securities
Cost or Amortized Cost	$ 57,097		$ 61,491
Gross Unrealized Gains	4,320	2,813
Gross Unrealized Losses	(351)	(1,077)
Available-for-sale Securities, Fair Value	61,069		63,225
Non-Credit OTTI	12		19
ABS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,313		2,404
Gross Unrealized Gains	36	25
Gross Unrealized Losses	(40)	(64)
Available-for-sale Securities, Fair Value	2,309		2,365
Non-Credit OTTI	1		2
Collateralized Debt Obligations [Member]
Available-for-Sale Securities
Cost or Amortized Cost	2,360		2,340
Gross Unrealized Gains	118	108
Gross Unrealized Losses	(47)	(59)
Available-for-sale Securities, Fair Value	2,434		2,387
Non-Credit OTTI	0		0
CMBS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	4,495		4,288
Gross Unrealized Gains	226	216
Gross Unrealized Losses	(25)	(58)
Available-for-sale Securities, Fair Value	4,696		4,446
Non-Credit OTTI	6		6
Corporate [Member]
Available-for-Sale Securities
Cost or Amortized Cost	26,223		27,013
Gross Unrealized Gains	2,570	1,823
Gross Unrealized Losses	(125)	(346)
Available-for-sale Securities, Fair Value	28,668		28,490
Non-Credit OTTI	3		7
Foreign Government Debt Securities [Member]
Available-for-Sale Securities
Cost or Amortized Cost	1,650		4,228
Gross Unrealized Gains	79	52
Gross Unrealized Losses	(22)	(176)
Available-for-sale Securities, Fair Value	1,707		4,104
Non-Credit OTTI	0		0
Municipal [Member]
Available-for-Sale Securities
Cost or Amortized Cost	11,796		11,932
Gross Unrealized Gains	933	425
Gross Unrealized Losses	(16)	(184)
Available-for-sale Securities, Fair Value	12,713		12,173
Non-Credit OTTI	0		0
RMBS [Member]
Available-for-Sale Securities
Cost or Amortized Cost	4,324		4,639
Gross Unrealized Gains	135	90
Gross Unrealized Losses	(33)	(82)
Available-for-sale Securities, Fair Value	4,426		4,647
Non-Credit OTTI	2		4
U.S. Treasuries [Member]
Available-for-Sale Securities
Cost or Amortized Cost	3,157		3,797
Gross Unrealized Gains	146	7
Gross Unrealized Losses	(10)	(59)
Available-for-sale Securities, Fair Value	3,293		3,745
Non-Credit OTTI	0		0
Fixed maturities [Member]
Available-for-Sale Securities
Gross Unrealized Gains	4,243	2,746
Gross Unrealized Losses	(318)	(1,028)
Available-for-sale Securities, Fair Value	60,246		62,357
Non-Credit OTTI	12		19
Equity Securities, AFS [Member]
Available-for-Sale Securities
Gross Unrealized Gains	77	67
Gross Unrealized Losses	(33)	(49)
Available-for-sale Securities, Fair Value	823		868
Non-Credit OTTI	$ 0		$ 0