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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 50 | $ 25 | $ 59
Realized capital gains (losses) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 53 | (15) | 43
Life contract benefits |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (1) | 7 | (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 | (31) | (7) | 43
Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 29 | 40 | (22)
Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 40 | 51 | (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 | 40 | 51 | (2)
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
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
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
Equity and index contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 72 | (13) | (24)
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 | (116) | 21
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
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 | 22 | 63 | (24)
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 | 29 | 40 | (21)
Embedded derivative financial instruments |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (54) | (63) | 62
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 contract benefits |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (1) | 7 | (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 | (53) | (70) | 67
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 | (20) | 8 | 28
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 | (20) | 8 | 29
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
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 | 0 | 0 | (1)
Credit default contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 7 | (8) | 2
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 | 7 | (8) | 2
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 swap agreements - fixed income |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 1 | 14 | (1)
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 | 14 | (1)
Total return swap agreements - 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
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 | 0 | 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 | 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 | 4 | 36 | (6)
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 | 4 | 36 | (6)
Total return swap agreements - 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
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 | 0 | 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 | $ 0 | $ 0

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