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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance |  | $ 36 |  |  | $ 37
Recorded Investment |  | 36 |  |  | 37
Related Allowance |  | 0 |  |  | 0
Carrying Value |  | 36 |  |  | 37
Average Investment | [1] | 36 | $ 17 |  |
Interest Income |  | 0 | 0 |  |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance |  | 0 |  |  | 0
Recorded Investment |  | 0 |  |  | 0
Related Allowance |  | 0 |  |  | 0
Carrying Value |  | 0 |  |  | 0
Average Investment |  | 0 | 0 | [1] |
Interest Income |  | 0 | 0 |  |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance |  | 36 |  |  | 37
Recorded Investment |  | 36 |  |  | 37
Related Allowance |  | 0 |  |  | 0
Carrying Value |  | 36 |  |  | $ 37
Average Investment |  | 36 | 17 | [1] |
Interest Income |  | $ 0 | $ 0 |  |
[1] | (1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

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