Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Mar. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized capital losses, excluding net OTTI losses recognized in earnings	$ (603,000,000)		$ 719,000,000	$ (707,000,000)		$ (522,000,000)
Income before income taxes	(42,000,000)		96,000,000	471,000,000		354,000,000
Income tax expense (benefit)	(53,000,000)		3,000,000	93,000,000		59,000,000
Net income (loss)	(35,000,000)		87,000,000	351,000,000		375,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(538,000,000)	[1]		(394,000,000)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(20,000,000)	[1]		(1,073,000,000)	[1]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax			477,000,000			544,000,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			38,000,000			(2,000,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax			(8,000,000)			6,000,000
Other Comprehensive Income (Loss), Net of Tax	(558,000,000)	[1]	507,000,000	(1,467,000,000)	[1]	548,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	520,000,000	[1]		520,000,000	[1]		1,078,000,000		1,987,000,000	[1]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized capital losses, excluding net OTTI losses recognized in earnings	13,000,000	[2]		1,559,000,000	[2]
Income before income taxes	13,000,000			1,559,000,000
Income tax expense (benefit)	5,000,000			546,000,000
Net income (loss)	8,000,000			1,013,000,000
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	-49	[1]		-77	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(489,000,000)	[1]		(276,000,000)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(8,000,000)	[1]		(1,013,000,000)	[1]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	121,000,000	[1]		121,000,000	[1]		182,000,000	[1]	258,000,000	[1]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(64,000,000)	[1]		(64,000,000)	[1]		(64,000,000)	[1]	(23,000,000)	[1]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(497,000,000)	[1]		(1,289,000,000)	[1]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(61,000,000)	[1]		(137,000,000)	[1]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	0	[1]		(41,000,000)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax	463,000,000	[1]		463,000,000	[1]		960,000,000	[1]	1,752,000,000	[1]
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	[1]		0	[1]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(12,000,000)	[1]		(60,000,000)	[1]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income (loss)	20,000,000			1,073,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	6,000,000			33,000,000
Net income (loss)	12,000,000			60,000,000
Cash Flow Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	18,000,000		16,000,000	93,000,000		47,000,000
Retirement Plans and Individual Life Businesses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized capital losses, excluding net OTTI losses recognized in earnings				1,500,000,000
Gain (Loss) on Derivative Instruments, Net, Pretax				$ 100,000,000

[1] [1] All amounts are net of tax and DAC.

[2] Includes $1.5 billion of net unrealized gains on securities relating to the sales of the Retirement Plans and Individual Life businesses.