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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 10 | $ 27 | $ 48 | $ 6
Realized capital gains (losses) |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 18 | 22 | 106 | (24)
Life contract benefits |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 10 | (5) | (14) | 3
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 | (49) | 5 | (30) | 1
Operating costs and expenses |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 31 | 5 | (14) | 26
Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 1 | 19 | 40 | 26
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 | 1 | 19 | 40 | 26
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 | 65 | (1) | (2) | (20)
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 | 2 | (17) | 30 | (88)
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 | 32 | 11 | (18) | 42
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 | 31 | 5 | (14) | 26
Embedded derivative financial instruments |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (71) | (11) | (26) | (38)
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 | 10 | (5) | (14) | 3
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 | (81) | (6) | (12) | (41)
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) | 5 | 31 | 10
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) | 5 | 31 | 10
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 | 0 | 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 | 12 | (1) | 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 | 12 | (1) | 4 | (5)
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 | 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 | 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 | 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 | 7 | 8 | (2) | 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 | 7 | 8 | (2) | 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 | 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 | 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 | 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 | 1 | 8 | 3 | 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 | 1 | 8 | 3 | 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 | 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 | 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 | $ 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=121590274&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=121590274&loc=SL5624171-113959 + Details
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