Investment Holding Level 4 Net Realized Capital Gains (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investment Holdings [Line Items]
Available-for-sale Securities, Gross Realized Gains	$ 47	$ 33	$ 138	$ 217
Available-for-sale Securities, Gross Realized Losses	6	33	66	181
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	12	24	23	32
Periodic Net Coupon Settlements on Credit Derivatives	1	2	1	5
Gain (Loss) on Coinsurance and Modified Coinsurance Reinsurance Contracts	(1)	3	(48)	29
Realized Investment Gains (Losses)	(31)	(22)	(145)	(18)
Foreign Currency Transaction Gain (Loss), Realized	(10)	(17)
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	(19)	2	(122)	14
Proceeds from Sale of Available-for-sale Securities	1,800	2,300	5,700	7,900
Other Investments [Member]
Investment Holdings [Line Items]
Realized Investment Gains (Losses)	(2)	(22)	(41)	(41)
Mortgages [Member]
Investment Holdings [Line Items]
Valuation Allowances and Reserves, Adjustments	0	0	0	(4)
Variable Annuity [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(58)	19	(106)	(11)
Not Designated as Hedging Instrument [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(47)	22	(28)	(18)
Not Designated as Hedging Instrument [Member] \| Three Win Related Foreign Currency Swaps [Member] \| JAPAN
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	13	8
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1)	2	(5)	4
Not Designated as Hedging Instrument [Member] \| Macro Hedge Program [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(64)	51	(98)	24
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Investment Holdings [Line Items]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments		(24)	49	10
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Investment Holdings [Line Items]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	$ 28	$ (24)	$ 49	$ 10

Gain (Loss) on Coinsurance and Modified Coinsurance Reinsurance Contracts

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Periodic net coupon settlements on credit derivatives.

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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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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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability.

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-Name Regulation S-X (SX)
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-Section 09
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