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Fair Value of Financial Instruments - Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | $ 278,356 | $ 266,513
Liabilities | (18,301) | (16,962)
Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 232 | 288
Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 392 | 233
Fair Value | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 19,647 | 17,047
Fair Value | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 6,588 | 5,015
Fair Value | Policy loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,476 | 2,476
Fair Value | Cash and invested cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 5,801 | 3,365
Fair Value | Policyholder account balances and other liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (30,505) | (31,611)
Fair Value | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (299) | (249)
Fair Value | Long-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (5,304) | (5,182)
Fair Value | Funds withheld reinsurance-related liabilities – excluding embedded derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (16,877) | (17,089)
Carrying Amount | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 21,083 | 18,963
Carrying Amount | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 6,588 | 5,015
Carrying Amount | Policy loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,476 | 2,476
Carrying Amount | Cash and invested cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 5,801 | 3,365
Carrying Amount | Policyholder account balances and other liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (40,394) | (40,027)
Carrying Amount | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (300) | (250)
Carrying Amount | Long-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (5,856) | (5,699)
Carrying Amount | Funds withheld reinsurance-related liabilities – excluding embedded derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (16,877) | (17,089)
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 810 | 823
Liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Policy loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Cash and invested cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Policyholder account balances and other liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Long-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Funds withheld reinsurance-related liabilities – excluding embedded derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Significant Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 265,955 | 255,563
Liabilities | (4,052) | (4,555)
Significant Observable Inputs (Level 2) | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Significant Observable Inputs (Level 2) | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 369 | 233
Significant Observable Inputs (Level 2) | Fair Value | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 19,647 | 17,047
Significant Observable Inputs (Level 2) | Fair Value | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 1,119 | 667
Significant Observable Inputs (Level 2) | Fair Value | Policy loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,476 | 2,476
Significant Observable Inputs (Level 2) | Fair Value | Cash and invested cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 5,801 | 3,365
Significant Observable Inputs (Level 2) | Fair Value | Policyholder account balances and other liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Significant Observable Inputs (Level 2) | Fair Value | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (299) | (249)
Significant Observable Inputs (Level 2) | Fair Value | Long-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (5,304) | (5,182)
Significant Observable Inputs (Level 2) | Fair Value | Funds withheld reinsurance-related liabilities – excluding embedded derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 11,591 | 10,127
Liabilities | (14,249) | (12,407)
Significant Unobservable Inputs (Level 3) | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 232 | 288
Significant Unobservable Inputs (Level 3) | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 23 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 5,469 | 4,348
Significant Unobservable Inputs (Level 3) | Fair Value | Policy loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Cash and invested cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Policyholder account balances and other liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (30,505) | (31,611)
Significant Unobservable Inputs (Level 3) | Fair Value | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Long-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Funds withheld reinsurance-related liabilities – excluding embedded derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | $ (16,877) | $ (17,089)

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