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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021
Schedule of Investments [Line Items] |  |  |  |  |  |
Gross gains on sales |  | $ 68 | $ 96 | $ 99 | $ 174 |
Gross losses on sales |  | (15) | (22) | (46) | (30) |
Reduction due to intent to sell |  | 0 | 0 | 0 | (5) |
Net realized capital gains (losses) |  | 147 | 109 | 227 | (122) |
Equity Securities, FV-NI, Unrealized Gain (Loss) |  | 80 | 67 | 118 | (34) |
Continental Europe Operations [Member] | Net realized capital gains |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | (19) |  | (18) |  | $ 66
Life and Annuity Insurance Product Line, Run-off Business |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 46 | 46 |  | 46 |  |
Non-qualifying foreign currency derivatives |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Non-qualifying foreign currency derivatives |  | (29) | 7 | 6 | 99 |
Non-qualifying foreign currency derivatives | Other Credit Derivatives |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Non-qualifying foreign currency derivatives |  | 0 | 0 | (7) | 10 |
Other, net |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Other, net |  | (4) | 2 | 25 | 106 |
Equity Securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity securities |  | 88 | 75 | 131 | (311) |
Total Fixed Maturities, AFS |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Change in ACL on fixed maturities, AFS |  | 0 | (20) | 4 | (32) |
Mortgages [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Change in ACL on mortgage loans |  | $ 10 | $ (22) | $ 14 | $ (24) |

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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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- Definition Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from intent to sell or more likely than not will be required to sell before recovery of amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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