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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021
Schedule of Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain |  | $ 63 | $ 27 | $ 162 | $ 201 |
Gross losses on sales |  | (8) | (12) | (54) | (42) |
Reduction due to intent to sell |  | 0 | 0 | 0 | (5) |
Net realized gains (losses) |  | 70 | 6 | 297 | (116) |
Equity Securities, FV-NI, Unrealized Gain (Loss) |  | (17) | 36 | 92 | 6 |
Continental Europe Operations [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | (20) | (51) |
Continental Europe Operations [Member] | Net realized capital gains |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | (2) |  | (20) | (51) | $ 68
Life and Annuity Insurance Product Line, Run-off Business |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 46 |  |  | 46 |  |
Non-qualifying foreign currency derivatives |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Non-qualifying foreign currency derivatives |  | 10 | (2) | 16 | 97 |
Non-qualifying foreign currency derivatives | Other Credit Derivatives |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Non-qualifying foreign currency derivatives |  | 6 | (4) | (1) | 6 |
Other, net |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Other, net |  | 14 | (55) | 39 | 51 |
Equity Securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity securities |  | 3 | 42 | 134 | (269) |
Total Fixed Maturities, AFS |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Change in ACL on fixed maturities, AFS |  | 0 | (1) | 4 | (33) |
Mortgages [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Change in ACL on mortgage loans |  | $ (2) | $ 5 | $ 12 | $ (19) |

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- Definition Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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