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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Assets |  |  |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Net income
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)
PAB – Embedded Derivative |  |  |  |
Liabilities |  |  |  |
Balance, beginning of period | $ 904 | $ 784 | $ 873 | $ 726
Acquisitions from business combination | 0 | 0 | 0 | 0
Fair value changes in net income | 287 | 0 | 287 | 0
Net change included in interest sensitive contract benefits | 0 | 51 | (38) | 102
Fair value changes in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements or maturities | (30) | 0 | (30) | 0
Premiums less benefits | 35 | (26) | 104 | (19)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 1,196 | 809 | 1,196 | 809
Funds Withheld for Reinsurance Liabilities - Embedded Derivative |  |  |  |
Liabilities |  |  |  |
Balance, beginning of period | 0 | 0 | 0 | 0
Acquisitions from business combination | 0 | 0 | 0 | 0
Fair value changes in net income | 79 | 0 | 79 | 0
Net change included in interest sensitive contract benefits | 0 | 0 | 0 | 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 | 79 | 0 | 79 | 0
Invested Assets |  |  |  |
Assets |  |  |  |
Balance, beginning of period | 5,199 | 4,419 | 5,585 | 3,167
Acquisitions from business combination | 4,288 | 0 | 4,288 | 0
Fair value changes in net income | 12 | 11 | 12 | 97
Net change included in interest sensitive contract benefits | 0 | 0 | 0 | 0
Fair value changes in other comprehensive income | 875 | (1) | 182 | (1)
Purchases | 1,302 | 822 | 3,346 | 2,235
Sales | (2,048) | (631) | (3,785) | (878)
Settlements or maturities | (2) | 0 | (2) | 0
Premiums less benefits | 0 | 0 | 0 | 0
Transfers into Level 3 | 112 | 0 | 112 | 0
Transfers out of Level 3 | (139) | 0 | (139) | 0
Balance, end of period | 9,599 | 4,620 | 9,599 | 4,620
Derivative Assets |  |  |  |
Assets |  |  |  |
Balance, beginning of period | 257 | 167 | 227 | 121
Acquisitions from business combination | 0 | 0 | 0 | 0
Fair value changes in net income | 24 | 47 | 81 | 72
Net change included in interest sensitive contract benefits | 0 | 0 | 0 | 0
Fair value changes in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 39 | 30 | 74 | 60
Sales | 0 | 0 | 0 | 0
Settlements or maturities | (66) | (29) | (128) | (38)
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 | $ 254 | $ 215 | $ 254 | $ 215

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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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- Definition Amount of transfers of financial instrument classified as a liability out of 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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