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Fair Value of Financial Instruments - Summary of Valuation Techniques and Unobservable Inputs of Level 3 Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Assets |  |  |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Net income (loss) for period
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Other comprehensive income (loss)
Policyholders’ Account Balances – Embedded Derivative |  |  |  |
Liabilities |  |  |  |
Balance, beginning of period | $ 1,196 | $ 809 | $ 872 | $ 726
Acquisitions from business combination | 0 | 0 | 0 | 0
Fair value changes in net income | 533 | 23 | 858 | 125
Fair value changes in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements or maturities | 0 | 0 | (30) | 0
Premiums less benefits | 42 | (7) | 71 | (26)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 1,771 | 825 | 1,771 | 825
Funds Withheld for Reinsurance Liabilities - Embedded Derivative |  |  |  |
Liabilities |  |  |  |
Balance, beginning of period | 79 | 0 | 0 | 0
Acquisitions from business combination | 0 | 0 | 0 | 0
Fair value changes in net income | 199 | 0 | 278 | 0
Fair value changes in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements or maturities | 0 | 0 | 0 | 0
Premiums less benefits | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 278 | 0 | 278 | 0
Invested Assets |  |  |  |
Assets |  |  |  |
Balance, beginning of period | 9,598 | 4,620 | 5,585 | 3,167
Acquisitions from business combination | 0 | 0 | 4,288 | 0
Fair value changes in net income | 177 | 0 | 189 | 97
Fair value changes in other comprehensive income | (61) | (382) | 121 | (383)
Purchases | 1,697 | 653 | 5,042 | 2,888
Sales | (298) | (1,058) | (4,083) | (1,936)
Settlements or maturities | 0 | (12) | (2) | (12)
Premiums less benefits | 0 | 0 | 0 | 0
Transfers into Level 3 | 65 | 0 | 177 | 0
Transfers out of Level 3 | (203) | 0 | (342) | 0
Balance, end of period | 10,975 | 3,821 | 10,975 | 3,821
Derivative Assets |  |  |  |
Assets |  |  |  |
Balance, beginning of period | 254 | 215 | 227 | 121
Acquisitions from business combination | 0 | 0 | 0 | 0
Fair value changes in net income | 41 | (32) | 122 | 40
Fair value changes in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 37 | 38 | 111 | 98
Sales | (67) | 0 | (67) | 0
Settlements or maturities | 0 | (45) | (128) | (83)
Premiums less benefits | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | $ 265 | $ 176 | $ 265 | $ 176

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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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