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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 11 | $ 45 | $ 38 | $ 78
Realized capital gains (losses) |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (3) | 14 | 8 | 92
Operating costs and expenses |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 14 | 31 | 30 | (14)
Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 2 | 1 | 1 | 36
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 | 1 | 1 | 36
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 | 8 | 28 | 22 | 16
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 | (6) | (3) | (8) | 30
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 | 14 | 31 | 30 | (14)
Foreign currency contracts |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (2) | (4) | 8 | 21
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 | (2) | (4) | 8 | 21
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 | 1 | 13 | 5 | 3
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 | 13 | 5 | 3
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 | 2 | 7 | 2 | (2)
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 | 2 | 7 | 2 | (2)
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 |  | 0 |  | 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 |  | 0 |  | 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 |  | $ 0

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