Fair Value Measurements - Changes in level 3 recurring fair value measurements, liabilities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Beginning of Year	$ 14,654	$ 11,353	$ 15,042	$ 10,618
Net Realized and Unrealized (Gains) Losses Included in Income	(430)	519
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	42	165
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	51
Fair Value End of Period	14,654	11,353
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	1,361	514
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	$ 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Aggregate carrying amount in the consolidated balance sheets	$ 7,333		7,309
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Total net realized losses	Total net realized losses
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Total net realized losses	Total net realized losses
Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Aggregate carrying amount in the consolidated balance sheets	$ 7,300	$ 6,300
Policyholder contract deposits
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Beginning of Year	11,573	9,341	12,022	9,415
Net Realized and Unrealized (Gains) Losses Included in Income	(649)	(222)
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	200	148
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	0
Fair Value End of Period	11,573	9,341
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	1,291	784
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0
Derivative liabilities, net
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Realized and Unrealized (Gains) Losses Included in Income	233	145
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Beginning of Period	(775)	(1,020)
Net Realized and Unrealized (Gains) Losses Included in Income	233	145
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	(40)	34
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	0
Fair Value End of Period	(582)	(841)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	(164)	3
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0
Interest rate contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Beginning of Period	0	(364)
Net Realized and Unrealized (Gains) Losses Included in Income	0	54
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	0	27
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	0
Fair Value End of Period	0	(283)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	0	99
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0
Equity contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Beginning of Period	(765)	(645)
Net Realized and Unrealized (Gains) Losses Included in Income	256	107
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	(57)	(9)
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	0
Fair Value End of Period	(566)	(547)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	(187)	(112)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0
Other contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Beginning of Period	(10)	(11)
Net Realized and Unrealized (Gains) Losses Included in Income	(23)	(16)
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	17	16
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	0
Fair Value End of Period	(16)	(11)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	23	16
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0
Fortitude Re funds withheld payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Beginning of Year	3,663	2,853	$ 3,795	2,223
Net Realized and Unrealized (Gains) Losses Included in Income	(14)	596
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	(118)	(17)
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	51
Fair Value End of Period	3,663	2,853
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	234	(273)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	$ 0	0
Debt of consolidated investment entities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Beginning of Year		0		$ 0
Net Realized and Unrealized (Gains) Losses Included in Income		0
Other Comprehensive (Income) Loss		0
Purchases, Sales, Issuances and Settlements, Net		0
Gross Transfers In		0
Gross Transfers Out		0
Other		0
Fair Value End of Period		0
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period		0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period		$ 0

Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis Liabilities, Other Increase (Decrease)

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Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease), Other

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset) out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Indicates line item in statement of income or comprehensive income that includes gain (loss) from liability measured at fair value using unobservable input (level 3).

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Amount of liability position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

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