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Investments (Net Investment Gains Losses - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt and Equity Securities, Realized Gain (Loss) | $ (405) | $ 528 | $ (547) | $ 698
Equity Securities, FV-NI, Unrealized Gain (Loss) | (42) | 57 | (62) | 164
Net investment gains (losses) | (685) | 1,605 | (1,203) | 1,739
Foreign Currency Transaction Gain (Loss), Realized | (137) | 10 | (14) | 19
Metropolitan Property and Casualty Insurance Company |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gain (Loss) on Disposition of Business |  | 1,400 |  | 1,400
Equity Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | (40) | 50 | (62) | 113
Cash Flow Hedging [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net investment gains (losses) | 34 | 19 | 50 | 40
Foreign Currency Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedging [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Net investment gains (losses) | $ 42 | $ 19 | $ 60 | $ 48

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