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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
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Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 27 | $ 33
Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 11 | 78
Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 16 | (45)
Interest rate contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (1) | 35
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) | 35
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
Equity and index contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 14 | (12)
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) | 33
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 | 16 | (45)
Foreign currency contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 10 | 25
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 | 10 | 25
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
Credit default contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 4 | (10)
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 | 4 | (10)
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
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 |  | (9)
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 |  | (9)
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
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 |  | 4
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 |  | 4
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

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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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