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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Schedule of Investments [Line Items] |  |  |  |
Net realized losses | $ (13) | $ (90) | $ (44) | $ (161)
Proceeds from Sale of Debt Securities, Available-for-sale |  |  | 7,985 | 4,908
Transfer to Investments | 18 | 0 | 18 | 0
Gain (Loss) on Sale of Other Investments | $ 10 | (46) | $ 4 | (109)
Investment, Type [Extensible Enumeration] | Equity Securities [Member] |  | Equity Securities [Member] |
Debt Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 1,500 | 800 | $ 4,200 | 2,800
Not Designated as Hedging Instrument |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax | (11) | 13 | (5) | (3)
Non-qualifying foreign currency derivatives | 23 | (74) | 15 | (108)
Realized Investment Gains Losses |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | 27 | (14) | 71 | (5)
Total Fixed Maturities, AFS |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Realized Gain | 12 | 6 | 23 | 26
Gross losses on sales of fixed maturities | (62) | (27) | (148) | (87)
Change in ACL on fixed maturities, AFS | 0 | (5) | (2) | (13)
Equity Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity Securities, FV-NI, Realized Gain (Loss) | 1 | 1 | (14) | 75
Equity Securities, FV-NI, Unrealized Gain (Loss) | 26 | (14) | 90 | (43)
Equity securities | 27 | (13) | 76 | 32
Mortgages [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Change in ACL on mortgage loans | $ 0 | $ (5) | $ 3 | $ (10)

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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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of realized gain on 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/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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- Definition Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 2)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column C)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2 + Details
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