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Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 12,730 | $ 15,117
Fair Value | (90) | (526)
Asset Derivatives | 469 | 86
Liability Derivatives | (559) | (612)
Fixed maturities, available-for-sale |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 153 | 201
Fair Value | 0 | 1
Asset Derivatives | 0 | 1
Liability Derivatives | 0 | 0
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 9,957 | 10,888
Fair Value | 10 | (415)
Asset Derivatives | 448 | 52
Liability Derivatives | (438) | (467)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,620 | 4,028
Fair Value | (100) | (112)
Asset Derivatives | 21 | 33
Liability Derivatives | (121) | (145)
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,343 | 1,721
Fair Value | (13) | (85)
Asset Derivatives | 94 | 3
Liability Derivatives | (107) | (88)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 10,387 | 13,396
Fair Value | (77) | (441)
Asset Derivatives | 375 | 83
Liability Derivatives | (452) | (524)
Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,190 | 1,646
Fair Value | 0 | (86)
Asset Derivatives | 94 | 2
Liability Derivatives | (94) | (88)
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 7,300 | 7,900
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 153 | 75
Fair Value | (13) | 1
Asset Derivatives | 0 | 1
Liability Derivatives | (13) | 0
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 7,986 | 8,969
Fair Value | (83) | (479)
Asset Derivatives | 340 | 15
Liability Derivatives | (423) | (494)
Foreign currency swaps and forwards | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 213 | 682
Fair Value | (1) | 32
Asset Derivatives | 0 | 34
Liability Derivatives | (1) | (2)
Credit derivatives that purchase credit protection | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 61 | 78
Fair Value | 1 | (1)
Asset Derivatives | 1 | 0
Liability Derivatives | 0 | (1)
Credit derivatives that assume credit risk | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 823 | 851
Fair Value | 3 | 6
Asset Derivatives | 20 | 10
Liability Derivatives | (17) | (4)
Credit derivatives in offsetting positions | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,046 | 2,311
Fair Value | 2 | 0
Asset Derivatives | 13 | 23
Liability Derivatives | (11) | (23)
Equity index options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 258 | 5
Fair Value | 1 | 0
Asset Derivatives | 1 | 0
Liability Derivatives | 0 | 0
Contingent capital facility put option | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 | 500
Fair Value | 0 | 1
Asset Derivatives | 0 | 1
Liability Derivatives | $ 0 | $ 0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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