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Investments (Supplemental Net Investment Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net Investment Income [Line Items] |  |  |
Debt and Equity Securities, Realized Gain (Loss) | $ (725) | $ 1,229 | $ 1,056
Equity Securities, FV-NI, Unrealized Gain (Loss) | (86) | 177 | (153)
Income (Loss) from Equity Method Investments | 1,305 | 5,136 | 829
Net investment income |  |  |
Net Investment Income [Line Items] |  |  |
Debt and Equity Securities, Realized Gain (Loss) | 155 | 518 | 422
Debt and Equity Securities, Unrealized Gain (Loss) | (1,586) | 616 | 233
Debt and Equity Securities, Gain (Loss) | (1,431) | 1,134 | 655
Unit-linked investments |  |  |
Net Investment Income [Line Items] |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (1,286) | $ 730 | $ 489

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