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Derivative Financial Instruments - Gains and losses from valuation and settlements reported on derivatives not designated as accounting hedges (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 10 | $ 9
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 | (8) | (15)
Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 4 | 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 | 16 | 9
Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (2) | 8
Equity and index contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (9) | 13
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 | (2) | (7)
Equity and index contracts | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 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 | (4) | 13
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 | (3) | 7
Embedded derivative financial instruments |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 24 | 3
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
Embedded derivative financial instruments | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 4 | 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 | 20 | (4)
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
Foreign currency contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (6) | (6)
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 | (7) | (7)
Foreign currency contracts | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 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
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 | 1 | 1
Credit default contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 1 | (1)
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 | 1 | (1)
Credit default contracts | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 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
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

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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. + Details
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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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