Accumulated Other Comprehensive Income Loss Level 4 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 140	$ 1,077	$ 140	$ 1,077	$ 188	$ 928	$ 1,162	$ (79)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(68)	(48)	(779)	1,351
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	20	(37)	(9)	(195)
Other Comprehensive Income (Loss), Net of Tax	(48)	(85)	(788)	1,156
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	4	(83)	(33)	(73)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	9	0	9	(588)
Income Tax Expense (Benefit)	7	108	222	251
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	(20)		9
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		37		195
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		4
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		(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	15		47
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,563	2,193	1,563	2,193	1,657	2,370	2,255	987
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(113)	(22)	(798)	1,277
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	19	(40)	(9)	(71)
Other Comprehensive Income (Loss), Net of Tax	(94)	(62)	(807)	1,206
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	(19)	40	9	71
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax		0		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	29	(61)	(14)	(186)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		0		50
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(29)	61	14	186
Income Tax Expense (Benefit)	(10)	21	5	65
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(4)	(5)	(4)	(5)	(7)	(5)	(7)	(12)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	2	1	0	4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1	1	1	3
Other Comprehensive Income (Loss), Net of Tax	3	2	1	7
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	(1)	(1)	(1)	(3)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	1	2	2	5
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(1)	(2)	(2)	(5)
Income Tax Expense (Benefit)	0	(1)	(1)	(2)
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	170	120	170	120	122	150	141	108
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	58	(15)	49	48
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(10)	(6)	(29)	(36)
Other Comprehensive Income (Loss), Net of Tax	48	(21)	20	12
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	10	6	29	36
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	16	9	44	56
Income Tax Expense (Benefit)	6	3	15	20
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(38)	0	(38)	0	(24)	(8)	13	91
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(14)	(13)	(30)	21
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	(112)
Other Comprehensive Income (Loss), Net of Tax	(14)	(13)	(30)	(91)
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		0		(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		0		172
Income Tax Expense (Benefit)		0		60
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,551)	(1,231)	(1,551)	(1,231)	$ (1,560)	$ (1,579)	$ (1,240)	$ (1,253)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1)	1	0	1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	10	8	28	21
Other Comprehensive Income (Loss), Net of Tax	9	9	28	22
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	(10)	(8)	(28)	(21)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	2	2	5	5
Defined Benefit Plan, Actuarial Gain (Loss)	(17)	(14)	(48)	(38)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(15)	(12)	(43)	(33)
Income Tax Expense (Benefit)	(5)	(4)	(15)	(12)
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	16	9	44	56
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	1		4	(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		(4)
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	0		(7)	$ (9)
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		(9)
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	$ 15		$ 47
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