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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 253 | $ 285 | $ 505 | $ 543
Investment expenses | (9) | (9) | (18) | (17)
Net investment income (excluding net realized capital gains or losses) | 244 | 276 | 487 | 526
Net realized capital gains (losses) | (98) | 13 | (173) | 60
Net investment income | 146 | 289 | 314 | 586
Credit-related impairment loss | (22) | 0 | 16 | 0
Yield-related impairment loss | 30 | 2 | 48 | 32
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 9 | 10 | 18 | 19
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 172 | 160 | 336 | 317
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 13 | 13 | 24 | 28
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 68 | $ 112 | $ 145 | $ 198

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