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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 31, 2021 | May 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | May 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Investments accounted for using the equity method |  |  | $ 1,378 |  |  | $ 1,378 |  | $ 1,235
Net investment income |  |  | 164 | $ 88 |  | 352 | $ 192 |
Annuity subsidiaries |  |  |  |  |  |  |  |
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net proceeds from sale of businesses | $ 3,570 |  |  |  |  |  |  |
Post-closing adjustments | 32 | $ 32 |  |  | $ 32 |  |  |
Gain on sale, net of tax | 656 | 697 |  | 0 | 656 |  | 0 |
Real estate-related investments | Continuing operations |  |  |  |  |  |  |  |
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net investment income |  |  | $ 22 | $ 7 |  | $ 51 | $ 19 |
Great American Life Insurance Company | Investments accounted for using the equity method |  |  |  |  |  |  |  |
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Investments accounted for using the equity method | 480 | 480 |  |  | 480 |  |  |
Great American Life Insurance Company | Real Estate |  |  |  |  |  |  |  |
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Other Real Estate | $ 100 | $ 100 |  |  | $ 100 |  |  |

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