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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
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 59 | $ 38 | $ 11
Realized capital gains (losses) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 43 | (46) | 0
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 | (5) | 9 | 9
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 | 43 | 41 | 18
Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (22) | 34 | (16)
Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (2) |  |
Interest rate contracts | Realized capital gains (losses) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (2) |  |
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 | (24) | 60 | 25
Equity and index contracts | Realized capital gains (losses) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 21 | (15) | (12)
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 | (24) | 47 | 18
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 | (21) | 28 | 19
Embedded derivative financial instruments |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 62 | 3 | 9
Embedded derivative financial instruments | Realized capital gains (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 | (5) | 9 | 9
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 | 67 | (6) | 0
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 | 28 | (21) | (18)
Foreign currency contracts | Realized capital gains (losses) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 29 | (27) | 17
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 | (1) | 6 | (35)
Credit default contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 2 | (4) | (5)
Credit default contracts | Realized capital gains (losses) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 2 | (4) | (5)
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
Total return swap agreements - equity index |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (1) |  |
Total return swap agreements - equity index | Realized capital gains (losses) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (6) |  |
Total return swap agreements - equity index | 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 |  |
Total return swap agreements - equity index | 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 |  |
Total return swap agreements - equity index | 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 |  |
Total return swap agreements - fixed income |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (6) |  |
Total return swap agreements - fixed income | Realized capital gains (losses) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (1) |  |
Total return swap agreements - fixed income | 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 |  |
Total return swap agreements - fixed income | 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 |  |
Total return swap agreements - fixed income | 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 |  |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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