Fair Value - Schedule of Fair Value Option Mortgage Loans (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage loans	$ (20)	$ (20)	$ (44)	$ (23)
Mortgage loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Unpaid principal balance	105,204		105,204		$ 96,269
Mark to fair value	(1,623)		(1,623)		(725)
Fair value	103,581		103,581		95,544
Commercial Mortgage
Fair Value, Option, Quantitative Disclosures [Line Items]
Unpaid principal balance of commercial mortgage loans 90 days or more past due and/or in non-accrual status	1,027		1,027		992
Mark to fair value of commercial mortgage loans 90 days or more past due and/or in non-accrual status	(332)		(332)		(337)
Fair value of commercial mortgage loans 90 days or more past due and/or in non-accrual status	695		695		655
Fair value of commercial mortgage loans 90 days or more past due	298		298		274
Fair value of commercial mortgage loans in non-accrual status	695		695		655
Residential Mortgage Loan
Fair Value, Option, Quantitative Disclosures [Line Items]
Unpaid principal balance of commercial mortgage loans 90 days or more past due and/or in non-accrual status	1,912		1,912		826
Mark to fair value of commercial mortgage loans 90 days or more past due and/or in non-accrual status	(184)		(184)		(85)
Fair value of commercial mortgage loans 90 days or more past due and/or in non-accrual status	1,728		1,728		741
Fair value of commercial mortgage loans 90 days or more past due	829		829		741
Fair value of commercial mortgage loans in non-accrual status	1,655		1,655		678
Residential Mortgage Loan \| Government-Guaranteed Collateral
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of commercial mortgage loans 90 days or more past due	$ 73		$ 73		$ 63

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This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets.

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This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

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This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

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For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due, in nonaccrual status, or both.

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