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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 449 | $ 252
Investment expenses | (10) | (9)
Net investment income (excluding net realized capital losses) | 439 | 243
Net realized capital losses | (105) | (75)
Net investment income | 334 | 168
Credit-related impairment loss | 1 | 38
Yield-related impairment loss | 24 | 18
Supporting experience-rated products |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Net investment income | 8 | 9
Debt securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 191 | 164
Mortgage loans |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 13 | 11
Other investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 245 | $ 77

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