Variable Interest Entities - Investments in Qualified Affordable Housing Tax Credits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Proportional amortization	$ 200,000,000	$ 200,000,000	$ 189,000,000
Tax credits and other benefits(b)	(248,000,000)	(230,000,000)	(219,000,000)
Changes in carrying amount of equity method investments	$ 8,000,000	$ 0	$ 0
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Applicable income tax expense	Applicable income tax expense	Applicable income tax expense
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration]	Applicable income tax expense	Applicable income tax expense	Applicable income tax expense
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration]	Increase (Decrease) in Other Operating Assets	Increase (Decrease) in Other Operating Assets	Increase (Decrease) in Other Operating Assets
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration]	Increase (Decrease) in Other Operating Assets	Increase (Decrease) in Other Operating Assets	Increase (Decrease) in Other Operating Assets
Impairment losses	$ 0	$ 0	$ 0