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Fair Value of Financial Instruments - Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	$ 270,346	$ 278,356
Liabilities	(16,061)	(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	483	392
Fair Value | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	20,373	19,647
Fair Value | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	6,170	6,588
Fair Value | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	2,529	2,476
Fair Value | Cash and invested cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	4,284	5,801
Fair Value | Policyholder account balances and other liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	(30,876)	(30,505)
Fair Value | Policyholder account balances – funding agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	(508)
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	(5,356)	(5,304)
Fair Value | Funds withheld reinsurance-related liabilities – excluding embedded derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	(16,700)	(16,877)
Carrying Amount | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	21,326	21,083
Carrying Amount | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	6,170	6,588
Carrying Amount | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	2,529	2,476
Carrying Amount | Cash and invested cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	4,284	5,801
Carrying Amount | Policyholder account balances and other liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	(41,005)	(40,394)
Carrying Amount | Policyholder account balances – funding agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	(500)
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	(5,868)	(5,856)
Carrying Amount | Funds withheld reinsurance-related liabilities – excluding embedded derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	(16,700)	(16,877)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	938	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	257,843	265,955
Liabilities	(3,192)	(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	468	369
Significant Observable Inputs (Level 2) | Fair Value | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	20,373	19,647
Significant Observable Inputs (Level 2) | Fair Value | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	513	1,119
Significant Observable Inputs (Level 2) | Fair Value | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	2,529	2,476
Significant Observable Inputs (Level 2) | Fair Value | Cash and invested cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	4,284	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	(508)
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	(5,356)	(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	11,565	11,591
Liabilities	(12,869)	(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	15	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	5,657	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	(30,876)	(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	$ (16,700)	$ (16,877)

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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