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Investments (Accrued Investment Income) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Net Investment Income [Line Items] |  |  |
Accrued investment income | [1] | $ 3,063 | $ 3,193
Fixed maturities |  |  |
Net Investment Income [Line Items] |  |  |
Accrued investment income |  | 2,558 | 2,676
Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Accrued investment income |  | 8 | 7
Commercial mortgage and other loans |  |  |
Net Investment Income [Line Items] |  |  |
Accrued investment income |  | 196 | 205
Policy loans |  |  |
Net Investment Income [Line Items] |  |  |
Accrued investment income |  | 277 | 274
Other invested assets |  |  |
Net Investment Income [Line Items] |  |  |
Accrued investment income |  | 21 | 27
Short-term investments and cash equivalents |  |  |
Net Investment Income [Line Items] |  |  |
Accrued investment income |  | $ 3 | $ 4
[1] | See Note 4 for details of balances associated with variable interest entities.

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