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Level 4~Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 12,875 | $ 12,730
Fair Value | (74) | (90)
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 499 | 469
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | 573 | 559
Fixed maturities, available-for-sale |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 153 | 153
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,702 | 9,957
Fair Value | 12 | 10
Asset Derivatives | 35 | 448
Liability Derivatives | (23) | (438)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 11,020 | 2,620
Fair Value | (86) | (100)
Asset Derivatives | 464 | 21
Liability Derivatives | (550) | (121)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 10,546 | 10,387
Fair Value | (54) | (77)
Asset Derivatives | 362 | 375
Liability Derivatives | (416) | (452)
Interest Rate Swap [Member] | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,176 | 2,190
Fair Value | 0 | 0
Asset Derivatives | 137 | 94
Liability Derivatives | (137) | (94)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 7,200 | 7,300
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 153 | 153
Fair Value | (20) | (13)
Asset Derivatives | 0 | 0
Liability Derivatives | (20) | (13)
Cash Flow Hedging |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,329 | 2,343
Fair Value | (20) | (13)
Asset Derivatives | 137 | 94
Liability Derivatives | (157) | (107)
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 8,108 | 7,986
Fair Value | (66) | (83)
Asset Derivatives | 338 | 340
Liability Derivatives | (404) | (423)
Foreign currency swaps and forwards | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 362 | 213
Fair Value | (1) | (1)
Asset Derivatives | 1 | 0
Liability Derivatives | (2) | (1)
Credit derivatives that purchase credit protection | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 7 | 61
Fair Value | 0 | 1
Asset Derivatives | 0 | 1
Liability Derivatives | 0 | 0
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 978 | 823
Fair Value | 12 | 3
Asset Derivatives | 14 | 20
Liability Derivatives | (2) | (17)
Credit derivatives in offsetting positions | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 965 | 1,046
Fair Value | 0 | 2
Asset Derivatives | 8 | 13
Liability Derivatives | (8) | (11)
Equity index options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 126 | 258
Fair Value | 1 | 1
Asset Derivatives | 1 | 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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