Investment Holding Level 4 Net Realized Capital Gains (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Investment Holdings [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	$ 0	$ 10
Available-for-sale Securities, Gross Realized Gains	50	30
Available-for-sale Securities, Gross Realized Losses	29	47
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	0	10
Gain (Loss) on Coinsurance and Modified Coinsurance Reinsurance Contracts	(2)	(22)
Foreign Currency Transaction Gain (Loss), before Tax	(18)	(44)
Realized Investment Gains (Losses)	(46)	(117)
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	(46)	(107)
Proceeds from Sale of Available-for-sale Securities	2,400	2,200
Available-for-sale Securities [Member]
Investment Holdings [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	0	1
Other Investments [Member]
Investment Holdings [Line Items]
Realized Investment Gains (Losses)	4	(27)
Variable Annuity [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(68)	(31)
Not Designated as Hedging Instrument [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(48)	(3)
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	17	34
Not Designated as Hedging Instrument [Member] \| Macro Hedge Program [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(86)	(14)
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	21	(26)
Other Credit Derivatives [Member] \| Not Designated as Hedging Instrument [Member]
Investment Holdings [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 5	$ 16

Gain (Loss) on Coinsurance and Modified Coinsurance Reinsurance Contracts

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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)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (b)(7)
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- Definition

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.

+ References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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- Definition

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
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-Name Accounting Standards Codification
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
-Section S99
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-Subparagraph (SX 210.7-04.3(a))
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