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Investments (Net Unrealized Gains Losses on Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Gain (Loss) on Securities [Line Items] |  |
Net unrealized gains (losses) on investments | $ 37,449 | $ 58,417
Fixed maturities | Available-for-sale | With an allowance |  |
Gain (Loss) on Securities [Line Items] |  |
Net unrealized gains (losses) on investments | (5) | (25)
Fixed maturities | Available-for-sale | Without an allowance |  |
Gain (Loss) on Securities [Line Items] |  |
Net unrealized gains (losses) on investments | 37,610 | 58,593
Derivatives designated as cash flow hedges |  |
Gain (Loss) on Securities [Line Items] |  |
Net unrealized gains (losses) on investments | (159) | (168)
Derivatives designated as fair value hedges |  |
Gain (Loss) on Securities [Line Items] |  |
Net unrealized gains (losses) on investments | 12 | 10
Other investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net unrealized gains (losses) on investments | (9) | $ 7
Other investments | Held-to-maturity |  |
Gain (Loss) on Securities [Line Items] |  |
Net unrealized gains (losses) on investments | $ 0 |

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