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Derivative Financial Instruments and Off-balance sheet Financial Instruments - Derivatives not designated as accounting hedges (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 38 | $ 11 | $ (18)
Realized capital gains and losses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (46) | 0 | (24)
Life and annuity contract benefits |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 9 | 9 | (7)
Interest credited to contractholder funds |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 41 | 18 | 22
Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 34 | (16) | (9)
Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives |  |  | 1
Interest rate contracts | Realized capital gains and losses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives |  |  | 1
Interest rate contracts | Life and annuity contract benefits |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives |  |  | 0
Interest rate contracts | Interest credited to contractholder funds |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives |  |  | 0
Interest rate contracts | Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives |  |  | 0
Equity and index contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 60 | 25 | (9)
Equity and index contracts | Realized capital gains and losses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (15) | (12) | 1
Equity and index contracts | Life and annuity contract benefits |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0 | 0
Equity and index contracts | Interest credited to contractholder funds |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 47 | 18 | (9)
Equity and index contracts | Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 28 | 19 | (1)
Embedded derivative financial instruments |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 3 | 9 | 24
Embedded derivative financial instruments | Realized capital gains and losses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0 | 0
Embedded derivative financial instruments | Life and annuity contract benefits |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 9 | 9 | (7)
Embedded derivative financial instruments | Interest credited to contractholder funds |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (6) | 0 | 31
Embedded derivative financial instruments | Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0 | 0
Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (21) | (18) | (32)
Foreign currency contracts | Realized capital gains and losses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (27) | 17 | (24)
Foreign currency contracts | Life and annuity contract benefits |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0 | 0
Foreign currency contracts | Interest credited to contractholder funds |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0 | 0
Foreign currency contracts | Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 6 | (35) | (8)
Credit default contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (4) | (5) | (2)
Credit default contracts | Realized capital gains and losses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (4) | (5) | (2)
Credit default contracts | Life and annuity contract benefits |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0 | 0
Credit default contracts | Interest credited to contractholder funds |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0 | 0
Credit default contracts | Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 0 | $ 0 | $ 0

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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