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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 285 | $ 141 | $ 543 | $ 347
Investment expenses | (9) | (9) | (17) | (17)
Net investment income (excluding net realized capital gains or losses) | 276 | 132 | 526 | 330
Net realized capital gains | 13 | 52 | 60 | 16
Net investment income | 289 | 184 | 586 | 346
Yield-related impairment loss | 2 | 1 | 32 | 42
Credit-related impairment loss (gain) | 0 | (42) | 0 | 3
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 10 | 10 | 19 | 21
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 160 | 146 | 317 | 290
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 13 | 15 | 28 | 30
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 112 | $ (20) | $ 198 | $ 27

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