Accumulated Other Comprehensive Income Loss Level 4 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 928	$ (79)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	259	779
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(37)	(41)
Other Comprehensive Income (Loss), Net of Tax	222	738
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,150	659
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	(17)	13
Loss from discontinued operations, net of tax	0	29
Income Tax Expense (Benefit)	158us-gaap_IncomeTaxExpenseBenefit	143us-gaap_IncomeTaxExpenseBenefit
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	41
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	7	24
Gain (Loss) on Investments [Member] \| Interest Rate Swap [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
Gain (Loss) on Investments [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Reclassification out of Accumulated Other Comprehensive Income [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	1
Gain (Loss) on Investments [Member] \| Currency Swap [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	(10)
Gain (Loss) on Investments [Member] \| Currency Swap [Member] \| Cash Flow Hedging [Member] \| Reclassification out of Accumulated Other Comprehensive Income [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	(10)	0
Investment Income [Member] \| Interest Rate Swap [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	16
Investment Income [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Reclassification out of Accumulated Other Comprehensive Income [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	16	23
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	928	(79)
Other Comprehensive Income (Loss), Net of Tax	222	738
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,150	659
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,370	987
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	232	717
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(24)	(18)
Other Comprehensive Income (Loss), Net of Tax	208	699
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,578	1,686
Accumulated Net Unrealized Investment Gain (Loss) [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	24	18
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	(37)	(44)
Loss from discontinued operations, net of tax		(11)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	37	44
Income Tax Expense (Benefit)	13	15
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(5)	(12)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(4)	3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1	(1)
Other Comprehensive Income (Loss), Net of Tax	(3)	2
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8)	(10)
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
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	(2)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(1)	2
Income Tax Expense (Benefit)	0	1
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	150	108
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	32	29
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(5)	(16)
Other Comprehensive Income (Loss), Net of Tax	27	13
Accumulated Other Comprehensive Income (Loss), Net of Tax	177	121
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	5	16
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	7	24
Income Tax Expense (Benefit)	2	8
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8)	91
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(20)	17
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	(20)	17
Accumulated Other Comprehensive Income (Loss), Net of Tax	(28)	108
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,579)	(1,253)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	19	13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(9)	(6)
Other Comprehensive Income (Loss), Net of Tax	10	7
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,569)	1,246
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	6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(2)	(2)
Defined Benefit Plan, Actuarial Gain (Loss)	16	12
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	14	10
Income Tax Expense (Benefit)	$ 5	$ 4

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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