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Discontinued Operations - Impact of the sale of the annuity businesses (Details) - USD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 31, 2021 | May 31, 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] |  |  |  |  |  |  |
Cash proceeds from sale of businesses |  |  |  |  | $ 3,547 | $ 0 |
Net investment in annuity businesses sold, excluding AOCI |  |  |  |  | $ 5,601 |  | $ 6,789
Annuity subsidiaries |  |  |  |  |  |  |
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash proceeds from sale of businesses | $ 3,537 |  |  |  |  |  |
Receivable from MassMutual | 32 | $ 32 |  | $ 32 |  |  |
Sale related expenses | (8) |  |  |  |  |  |
Total net proceeds | 3,561 |  |  |  |  |  |
Net investment in annuity businesses sold, excluding AOCI | 2,865 | 2,865 |  | 2,865 |  |  | $ 2,893
Reclassify net deferred tax asset | 210 |  |  |  |  |  |
Realized gain on subsidiary | 906 |  |  |  |  |  |
Tax liabilities triggered by pending sale in the first quarter of 2021 | 41 |  |  |  |  |  |
Other tax expense on gain on sale of subsidiaries | (1) |  |  |  |  |  |
Total income tax expense on gain on sale of subsidiaries | 250 |  |  |  |  |  |
Gain on sale, net of tax | $ 656 | $ 697 | $ 0 | $ 656 |  | $ 0 |

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