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Fair Value of Financial Instruments - Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | $ 284,974 | $ 278,356
Liabilities | (20,603) | (18,301)
Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 232 | 232
Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 336 | 392
Fair Value | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 20,878 | 19,647
Fair Value | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 6,275 | 6,588
Fair Value | Policy loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,552 | 2,476
Fair Value | Cash and invested cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 7,143 | 5,801
Fair Value | Policyholder account balances and other liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (31,640) | (30,505)
Fair Value | Policyholder account balances – funding agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (1,030) |
Fair Value | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities |  | (299)
Fair Value | Long-term Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (5,447) | (5,304)
Fair Value | Funds withheld reinsurance-related liabilities – excluding embedded derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (16,560) | (16,877)
Carrying Amount | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 21,764 | 21,083
Carrying Amount | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 6,275 | 6,588
Carrying Amount | Policy loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,552 | 2,476
Carrying Amount | Cash and invested cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 7,143 | 5,801
Carrying Amount | Policyholder account balances and other liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (41,952) | (40,394)
Carrying Amount | Policyholder account balances – funding agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (1,000) |
Carrying Amount | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities |  | (300)
Carrying Amount | Long-term Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (5,767) | (5,856)
Carrying Amount | Funds withheld reinsurance-related liabilities – excluding embedded derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (16,560) | (16,877)
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 963 | 810
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 | Policyholder account balances – funding agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 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
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 | 271,208 | 265,955
Liabilities | (5,479) | (4,052)
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 | 312 | 369
Significant Observable Inputs (Level 2) | Fair Value | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 20,878 | 19,647
Significant Observable Inputs (Level 2) | Fair Value | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 681 | 1,119
Significant Observable Inputs (Level 2) | Fair Value | Policy loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 2,552 | 2,476
Significant Observable Inputs (Level 2) | Fair Value | Cash and invested cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 7,143 | 5,801
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 | Policyholder account balances – funding agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (1,030) |
Significant Observable Inputs (Level 2) | Fair Value | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities |  | (299)
Significant Observable Inputs (Level 2) | Fair Value | Long-term Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | (5,447) | (5,304)
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 | 12,803 | 11,591
Liabilities | (15,124) | (14,249)
Significant Unobservable Inputs (Level 3) | Mortgage loans on real estate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 232 | 232
Significant Unobservable Inputs (Level 3) | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | 24 | 23
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 | 5,594 | 5,469
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 | (31,640) | (30,505)
Significant Unobservable Inputs (Level 3) | Fair Value | Policyholder account balances – funding agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 0 |
Significant Unobservable Inputs (Level 3) | Fair Value | Short-term debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities |  | 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 | $ (16,560) | $ (16,877)

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