Accumulated Other Comprehensive Income, Net of Tax Level 4 (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (329,000,000)				$ 928,000,000				$ (329,000,000)	$ 928,000,000		$ (79,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)	(329,000,000)				928,000,000				(329,000,000)	928,000,000		(79,000,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(1,279,000,000)	1,142,000,000		(1,823,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(22,000,000)	135,000,000		1,099,000,000
Other Comprehensive Income (Loss), Net of Tax									(1,257,000,000)	1,007,000,000		(2,922,000,000)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				$ 928,000,000				$ (79,000,000)	928,000,000	(79,000,000)		2,843,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings									(54,000,000)	75,000,000		296,000,000
Income Tax Expense (Benefit)									305,000,000	350,000,000		246,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	$ 9,000,000	$ 0	0	37,000,000	$ 0	$ (617,000,000)	29,000,000	9,000,000	(551,000,000)		(1,049,000,000)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,279,000,000				2,370,000,000				1,279,000,000	2,370,000,000		987,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)					2,370,000,000					2,370,000,000		987,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(1,112,000,000)	1,474,000,000		(1,416,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(21,000,000)	91,000,000		1,015,000,000
Other Comprehensive Income (Loss), Net of Tax									(1,091,000,000)	1,383,000,000		(2,431,000,000)
Balance at the beginning 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
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) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7,000,000)				(5,000,000)				(7,000,000)	(5,000,000)		(12,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)					(5,000,000)					(5,000,000)		(12,000,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(3,000,000)	3,000,000		51,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(1,000,000)	(4,000,000)		16,000,000
Other Comprehensive Income (Loss), Net of Tax									(2,000,000)	7,000,000		35,000,000
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				(5,000,000)				(12,000,000)	(5,000,000)	(12,000,000)		(47,000,000)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	130,000,000				150,000,000				130,000,000	150,000,000		108,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)					150,000,000					150,000,000		108,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									18,000,000	89,000,000		(195,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									38,000,000	47,000,000		125,000,000
Other Comprehensive Income (Loss), Net of Tax									(20,000,000)	42,000,000		(320,000,000)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				150,000,000				108,000,000	150,000,000	108,000,000		428,000,000
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(55,000,000)				(8,000,000)				(55,000,000)	(8,000,000)		91,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)					(8,000,000)					(8,000,000)		91,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(47,000,000)	13,000,000		(337,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									0	112,000,000		(22,000,000)
Other Comprehensive Income (Loss), Net of Tax									(47,000,000)	(99,000,000)		(315,000,000)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				(8,000,000)				91,000,000	(8,000,000)	91,000,000		406,000,000
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)	(329,000,000)				928,000,000				(329,000,000)	928,000,000		(79,000,000)
Other Comprehensive Income (Loss), Net of Tax									(1,257,000,000)	1,007,000,000		(2,922,000,000)
Balance at the beginning of period, Accumulated Other Comprehensive Income (Loss)				928,000,000				(79,000,000)	928,000,000	(79,000,000)		2,843,000,000
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (1,676,000,000)				(1,579,000,000)				(1,676,000,000)	(1,579,000,000)		(1,253,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the end of period, Accumulated Other Comprehensive Income (Loss)					$ (1,579,000,000)					(1,579,000,000)		(1,253,000,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax									(135,000,000)	(437,000,000)		74,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									(38,000,000)	(111,000,000)		(35,000,000)
Other Comprehensive Income (Loss), Net of Tax									(97,000,000)	(326,000,000)		109,000,000
Balance at the beginning 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)
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									59,000,000	73,000,000		192,000,000
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
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									22,000,000
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										(135,000,000)		(1,099,000,000)
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									21,000,000	(91,000,000)		1,015,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings									(32,000,000)	217,000,000		1,515,000,000	[1]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(32,000,000)	217,000,000		1,515,000,000
Income Tax Expense (Benefit)									(11,000,000)	76,000,000		531,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									0	50,000,000		31,000,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax									0	172,000,000	[2]	(34,000,000)	[2]
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									1,000,000	4,000,000		16,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings									(2,000,000)	(6,000,000)		25,000,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(2,000,000)	(6,000,000)		25,000,000
Income Tax Expense (Benefit)									(1,000,000)	(2,000,000)		9,000,000
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									0	112,000,000		(22,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									0	172,000,000		(34,000,000)
Income Tax Expense (Benefit)									0	60,000,000		(12,000,000)
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									38,000,000	111,000,000		35,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(58,000,000)	(171,000,000)		(54,000,000)
Income Tax Expense (Benefit)									(20,000,000)	(60,000,000)		(19,000,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)									7,000,000	7,000,000		7,000,000
Defined Benefit Plan, Actuarial Gain (Loss)									(65,000,000)	(50,000,000)		(61,000,000)
Defined Benefit Plan, Settlements, Plan Assets									0	(128,000,000)		0
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									(38,000,000)	(47,000,000)		(125,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									59,000,000	73,000,000		192,000,000
Income Tax Expense (Benefit)									21,000,000	26,000,000		67,000,000
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									4,000,000			91,000,000	[3]
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									64,000,000			97,000,000
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									(9,000,000)			$ 4,000,000
Designated as Hedging Instrument [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									4,000,000	(1,000,000)
Designated as Hedging Instrument [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									64,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Interest 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
Designated as Hedging Instrument [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									$ (9,000,000)	$ (13,000,000)

[1] The December 31, 2013 amount includes $1.5 billion of net unrealized gains on securities relating to the sales of the Retirement Plans and Individual Life businesses.

[2] The December 31, 2014 amount relates to the sale of the HLIKK variable and fixed annuity business and the December 31, 2013 amount relates to the sale of the UK variable annuity business.

[3] The December 31, 2013 amount includes $71 of net gains on cash flow hedging instruments relating to the sales of the Retirement Plans and Individual Life businesses.