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Equity (Components of Net Unrealized Appreciation Depreciation of Balances Carried at Fair Value) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |
Fixed maturity securities available-for-sale |  | $ (56,735) | $ (51,121) |  |
Other invested assets |  | (2,829) | (2,363) |  |
Deferred policy acquisition costs |  | 3,616 | 3,512 | $ 3,398 | $ 3,240
Accumulated Other Comprehensive Income Loss Change In Component During Period |  | 2,812 | 3,123 | (1,712) |
Change In Net Unrealized Appreciation Depreciation [Member] |  |  |  |  |
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |
Fixed maturity securities available-for-sale |  | (2,837) | (3,258) | (1,759) |
Other invested assets | [1] | (29) | (37) | (20) |
Effect On Unrealized Appreciation Depreciation [Member] |  |  |  |  |
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |
Deferred policy acquisition costs |  | $ 54 | $ 98 | $ 27 |
[1] | Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.

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