Accumulated Other Comprehensive Income Loss Level 4 (Details) - Disposal Groups, Including Discontinued Operations, Name [Domain] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 188	$ 1,162	$ 188	$ 1,162	$ 1,150	$ 928	$ 659	$ (79)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(935)	651	(677)	1,431
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(27)	(148)	(63)	(190)
Other Comprehensive Income (Loss), Net of Tax	(962)	503	(740)	1,241
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	(20)	(3)	(37)	10
Loss from discontinued operations, net of tax	0	(617)	0	(588)
Income Tax Expense (Benefit)	57	0	215	143
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	27		63
Other Postretirement Benefit Plan [Member] | 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		148		190
Gain (Loss) on Investments [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2		3
Gain (Loss) on Investments [Member] | Currency Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	3		(7)
Investment Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	16		32
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Net of Tax			(740)	1,241
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,657	2,255	1,657	2,255	2,578	2,370	1,686	987
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(917)	582	(685)	1,299
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(4)	(13)	(28)	(31)
Other Comprehensive Income (Loss), Net of Tax	(921)	569	(713)	1,268
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | 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	4	13	28	31
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax		172		172
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	(6)	(82)	(43)	(125)
Loss from discontinued operations, net of tax		40		50
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	6	82	43	125
Income Tax Expense (Benefit)	2	29	15	44
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7)	(7)	(7)	(7)	(8)	(5)	(10)	(12)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1	4	(3)	7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	(1)	1	(2)
Other Comprehensive Income (Loss), Net of Tax	1	3	(2)	5
Accumulated Other-than-Temporary Impairment [Member] | 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	0	1	(1)	2
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	0	(1)	1	(3)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	0	1	(1)	3
Income Tax Expense (Benefit)	0	0	0	1
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	122	141	122	141	177	150	121	108
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(41)	35	(10)	64
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(14)	(15)	(18)	(31)
Other Comprehensive Income (Loss), Net of Tax	(55)	20	(28)	33
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Cash Flow Hedging [Member] | 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	14	15	18	31
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	21	23	28	47
Income Tax Expense (Benefit)	7	8	10	16
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(24)	13	(24)	13	(28)	(8)	108	91
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4	17	(16)	34
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	(112)	0	(112)
Other Comprehensive Income (Loss), Net of Tax	4	(95)	(16)	(78)
Accumulated Translation Adjustment [Member] | 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		(112)		(112)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		172		172
Income Tax Expense (Benefit)		60		60
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,560)	(1,240)	(1,560)	(1,240)	$ (1,569)	$ (1,579)	$ (1,246)	$ (1,253)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	18	13	37	27
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(9)	(7)	(18)	(14)
Other Comprehensive Income (Loss), Net of Tax	9	6	19	13
Accumulated Defined Benefit Plans Adjustment [Member] | Other Postretirement Benefit Plan [Member] | 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	9	7	18	14
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(1)	(1)	(3)	(3)
Defined Benefit Plan, Actuarial Gain (Loss)	15	12	31	24
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	14	11	28	21
Income Tax Expense (Benefit)	5	4	10	7
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	21	23	28	47
Designated as Hedging Instrument [Member] | Gain (Loss) on Investments [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2		3	2
Designated as Hedging Instrument [Member] | Gain (Loss) on Investments [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		1
Designated as Hedging Instrument [Member] | Gain (Loss) on Investments [Member] | Currency Swap [Member] | Cash Flow Hedging [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	3		(7)	$ 0
Designated as Hedging Instrument [Member] | Gain (Loss) on Investments [Member] | Currency Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0
Designated as Hedging Instrument [Member] | Investment Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 16		$ 32
Designated as Hedging Instrument [Member] | Investment Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 22