Significant Credit Concentrations (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Maximum Credit Exposure by Category
Total on-balance sheet	$ 245	$ 213
Customer Concentration Risk | Individuals | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	178	156
Customer Concentration Risk | Individuals | United States | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	145	129
Customer Concentration Risk | Individuals | Outside the United States | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	33	27
Customer Concentration Risk | Financial Services | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	12	11
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	37	25
Customer Concentration Risk | U.S. Government and agencies | On-balance sheet assets
Maximum Credit Exposure by Category
Total on-balance sheet	$ 1	$ 4