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Derivative Instruments (Gains (Losses) On Derivative Instruments Recorded Within Income (Loss) From Continuing Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Gains (losses) |  |  |  |  |
Gains (losses) |  | $ (104) | $ (96) | $ (140) | $ (165)
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) |  | 8 |  | 11 | 7
Designated as Hedging Instrument [Member] | Fair Value Hedges [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) |  | 10 | (8) | 44 | 2
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [1] | 1 | 1 | 2 | 2
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [1] | 5 | 4 | 11 | 9
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [1] | (4) | (6) | (9) | (13)
Designated as Hedging Instrument [Member] | Interest and Debt Expense [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [2] | 2 | (5) | (2) | (9)
Designated as Hedging Instrument [Member] | Interest and Debt Expense [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [2] |  | 7 | 6 | 15
Designated as Hedging Instrument [Member] | Realized Gain (Loss) [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [3] |  |  |  | 5
Designated as Hedging Instrument [Member] | Realized Gain (Loss) [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [3] | 14 | (9) | 47 |
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Interest rate contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [3] | (96) | 193 | (410) | 143
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Foreign currency contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [3] |  | (2) | 2 | 1
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Equity market contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [3] | (89) | (289) | (80) | (817)
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | GLB Embedded Derivatives [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [3] | 113 | 72 | 270 | 669
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Embedded derivatives - Reinsurance related [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [3] | 9 | (3) | 32 |
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Indexed Annuity And Embedded Derivatives [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [3] | (62) | (64) | (10) | (184)
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Commissions and other expenses [Member] | Equity market contracts [Member] |  |  |  |  |
Gains (losses) |  |  |  |  |
Gains (losses) | [4] | $ 3 | $ 5 | $ 1 | $ 14
[1] | Reported in net investment income on our Consolidated Statements of Comprehensive Income (Loss).
[2] | Reported in interest and debt expense on our Consolidated Statements of Comprehensive Income (Loss).
[3] | Reported in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).
[4] | Reported in commissions and other expenses on our Consolidated Statements of Comprehensive Income (Loss).

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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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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