Accumulated Other Comprehensive Income, Net of Tax Level 4 (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)	$ 928,000,000				$ (79,000,000)				$ 928,000,000	$ (79,000,000)	$ 2,843,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									1,142,000,000	(1,823,000,000)	1,647,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(135,000,000)	(1,099,000,000)	(55,000,000)
Other Comprehensive Income (Loss), Net of Tax									1,007,000,000	(2,922,000,000)	1,592,000,000
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				(79,000,000)				2,843,000,000	(79,000,000)	2,843,000,000	1,251,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings									75,000,000	296,000,000	846,000,000
Income Tax Expense (Benefit)									350,000,000	246,000,000	(309,000,000)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	37,000,000	0	(617,000,000)	29,000,000	(70,000,000)	(72,000,000)	(423,000,000)	(484,000,000)	(551,000,000)	(1,049,000,000)	(258,000,000)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)	2,370,000,000				987,000,000				2,370,000,000	987,000,000	3,418,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									1,474,000,000	(1,416,000,000)	1,928,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(91,000,000)	(1,015,000,000)	(21,000,000)
Other Comprehensive Income (Loss), Net of Tax									1,383,000,000	(2,431,000,000)	1,907,000,000
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				987,000,000				3,418,000,000	987,000,000	3,418,000,000	1,511,000,000
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Retirement Plans and Individual Life Businesses [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings									1,500,000,000	1,500,000,000
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)	(5,000,000)				(12,000,000)				(5,000,000)	(12,000,000)	(47,000,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									3,000,000	51,000,000	149,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									4,000,000	(16,000,000)	(97,000,000)
Other Comprehensive Income (Loss), Net of Tax									7,000,000	35,000,000	52,000,000
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				(12,000,000)				(47,000,000)	(12,000,000)	(47,000,000)	(99,000,000)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)	150,000,000				108,000,000				150,000,000	108,000,000	428,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									89,000,000	(195,000,000)	58,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(47,000,000)	(125,000,000)	(146,000,000)
Other Comprehensive Income (Loss), Net of Tax									42,000,000	(320,000,000)	(88,000,000)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				108,000,000				428,000,000	108,000,000	428,000,000	516,000,000
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)	(8,000,000)				91,000,000				(8,000,000)	91,000,000	406,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									13,000,000	(337,000,000)	(168,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(112,000,000)	22,000,000	0
Other Comprehensive Income (Loss), Net of Tax									(99,000,000)	(315,000,000)	(168,000,000)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				91,000,000				406,000,000	91,000,000	406,000,000	574,000,000
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)	928,000,000				(79,000,000)	(79,000,000)			928,000,000	(79,000,000)	2,843,000,000
Other Comprehensive Income (Loss), Net of Tax									1,007,000,000	(2,922,000,000)	1,592,000,000
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				(79,000,000)				2,843,000,000	(79,000,000)	2,843,000,000	1,251,000,000
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)	(1,579,000,000)				(1,253,000,000)				(1,579,000,000)	(1,253,000,000)	(1,362,000,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(437,000,000)	74,000,000	(320,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									111,000,000	35,000,000	209,000,000
Other Comprehensive Income (Loss), Net of Tax									(326,000,000)	109,000,000	(111,000,000)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				(1,253,000,000)				(1,362,000,000)	(1,253,000,000)	(1,362,000,000)	(1,251,000,000)
Cash Flow Hedging [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net									73,000,000	192,000,000	224,000,000
Cash Flow Hedging [Member] | Retirement Plans and Individual Life Businesses [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net										71
Interest Rate Swap [Member] | Gain (Loss) on Investments [Member] | Cash Flow Hedging [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net									(1,000,000)
Interest Rate Swap [Member] | Investment Income [Member] | Cash Flow Hedging [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net									87,000,000
Currency Swap [Member] | Gain (Loss) on Investments [Member] | Cash Flow Hedging [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net									(13,000,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax										(1,099,000,000)	(55,000,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									91,000,000	1,015,000,000	21,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings									217,000,000	1,515,000,000	32,000,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									217,000,000	1,515,000,000	32,000,000
Income Tax Expense (Benefit)									76,000,000	531,000,000	11,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									(50,000,000)	31,000,000	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax									172,000,000	(34,000,000)	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(4,000,000)	16,000,000	97,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings									(6,000,000)	25,000,000	149,000,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(6,000,000)		25,000,000
Income Tax Expense (Benefit)									(2,000,000)	9,000,000	52,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									112,000,000	(22,000,000)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									172,000,000	(34,000,000)	0
Income Tax Expense (Benefit)									60,000,000	(12,000,000)	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									111,000,000	35,000,000	209,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(171,000,000)	(54,000,000)	(322,000,000)
Income Tax Expense (Benefit)									(60,000,000)	(19,000,000)	(113,000,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)									7,000,000	7,000,000	(90,000,000)
Defined Benefit Plan, Actuarial Gain (Loss)									(50,000,000)	(61,000,000)	(232,000,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedging [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(47,000,000)	(125,000,000)	(146,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									73,000,000	192,000,000	224,000,000
Income Tax Expense (Benefit)									26,000,000	67,000,000	78,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swap [Member] | Gain (Loss) on Investments [Member] | Cash Flow Hedging [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net									(1,000,000)	91,000,000	90,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Swap [Member] | Investment Income [Member] | Cash Flow Hedging [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net									87,000,000	97,000,000	140,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Currency Swap [Member] | Gain (Loss) on Investments [Member] | Cash Flow Hedging [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net									$ (13,000,000)	$ 4,000,000	$ (6,000,000)