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Investments (Net Investment Income - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Net Investment Income [Line Items] |  |  |  |
Debt and Equity Securities, Realized Gain (Loss) | $ (405) | $ 528 | $ (547) | $ 698
Equity Securities, FV-NI, Unrealized Gain (Loss) | (42) | 57 | (62) | 164
Income (Loss) from Equity Method Investments | 386 | 1,000 | 1,500 | 2,300
Net investment income |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Debt and Equity Securities, Gain (Loss) | (777) | 413 | (1,300) | 674
Debt and Equity Securities, Realized Gain (Loss) | 40 | 94 | 109 | 261
Debt and Equity Securities, Unrealized Gain (Loss) | (817) | 319 | (1,400) | 413
Unit-linked investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (802) | $ 347 | $ (1,300) | $ 549

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