Fair Value Measurements - Changes in level 3 recurring fair value measurements, liabilities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Beginning of Year	$ 15,042	$ 10,618	$ 8,904
Net Realized and Unrealized (Gains) Losses Included in Income	3,669	1,124
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	704	238
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	51	352
Fair Value End of Year	15,042	10,618
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Year	484	2,195
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Year	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	$ 7,309	$ 5,616
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	$ 5,600
Policyholder contract deposits
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Beginning of Year	12,022	9,415	7,942
Net Realized and Unrealized (Gains) Losses Included in Income	1,921	859
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	686	614
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	0
Fair Value End of Year	12,022	9,415
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Year	796	1,472
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Year	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	75	(253)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Beginning of Period	(1,020)	(1,220)
Net Realized and Unrealized (Gains) Losses Included in Income	75	(253)
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	170	101
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	352
Fair Value End of Period	(775)	(1,020)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Year	160	192
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Year	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	(364)	(449)
Net Realized and Unrealized (Gains) Losses Included in Income	105	(170)
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	259	(84)
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	339
Fair Value End of Period	0	(364)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Year	0	255
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Year	0	0
Equity contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Beginning of Period	(645)	(761)
Net Realized and Unrealized (Gains) Losses Included in Income	33	(38)
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	(153)	141
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	13
Fair Value End of Period	(765)	(645)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Year	98	(107)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Year	0	0
Other contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Beginning of Period	(11)	(10)
Net Realized and Unrealized (Gains) Losses Included in Income	(63)	(45)
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	64	44
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	0	0
Fair Value End of Period	(10)	(11)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Year	62	44
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Year	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	3,795	2,223	2,182
Net Realized and Unrealized (Gains) Losses Included in Income	1,673	518
Other Comprehensive (Income) Loss	0	0
Purchases, Sales, Issuances and Settlements, Net	(152)	(477)
Gross Transfers In	0	0
Gross Transfers Out	0	0
Other	51	0
Fair Value End of Year	3,795	2,223
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Year	(472)	531
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Year	$ 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 Year		0
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Year		0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Year		$ 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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