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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 27 | $ 36 | $ 6 | $ 46
Realized capital gains (losses) |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 22 | 20 | (24) | 12
Life contract benefits |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (5) | 1 | 3 | 5
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 | 5 | 11 | 1 | 27
Operating costs and expenses |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 5 | 4 | 26 | 2
Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 19 | 1 | 26 | 1
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 | 19 | 1 | 26 | 1
Interest rate 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 | 0 | 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 | 0 | 0 | 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 | 0 | 0 | 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 | (1) | 15 | (20) | 6
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 | (17) | (1) | (88) | (3)
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 | 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 | 11 | 10 | 42 | 6
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 | 5 | 6 | 26 | 3
Embedded derivative financial instruments |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (11) | 2 | (38) | 26
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 | 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 | (5) | 1 | 3 | 5
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) | 1 | (41) | 21
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 | 0
Foreign currency contracts |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 5 | 17 | 10 | 11
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 | 5 | 19 | 10 | 12
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 | 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 | 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 | 0 | (2) | 0 | (1)
Total return swaps |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives |  | 1 |  | 1
Total return swaps | 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 |  | 1
Total return swaps | 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
Total return swaps | 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
Total return swaps | 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
Credit default contracts |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (1) |  | (5) | 1
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 | (1) |  | (5) | 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 | 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 swaps - fixed income |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 8 |  | 10 |
Total return swaps - 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 | 8 |  | 10 |
Total return swaps - fixed income | 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 |
Total return swaps - 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 |  | 0 |
Total return swaps - 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 |  | 0 |
Total return swaps - equity index |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 8 |  | 23 |
Total return swaps - 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 | 8 |  | 23 |
Total return swaps - equity index | 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 |
Total return swaps - 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 |  | 0 |
Total return swaps - 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 |  | $ 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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