Significant Credit Concentrations (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Maximum Credit Exposure by Category
Total on-balance sheet	$ 255	$ 245
Customer Concentration Risk | Individuals | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	194	178
Customer Concentration Risk | Individuals | United States | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	160	145
Customer Concentration Risk | Individuals | Outside the United States | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	34	33
Customer Concentration Risk | Financial Services | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	9	12
Customer Concentration Risk | Other | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	17	17
Customer Concentration Risk | Federal Reserve Bank | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	35	37
Customer Concentration Risk | U.S. Government and agencies | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	$ 0	$ 1