Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Gross amounts recognized
Federal funds sold and securities purchased under agreements to resell	$ 1,315	$ 1,170
Derivatives (included in other assets)	481	420
Total assets	1,796	1,590
Federal funds and other short-term borrowings	5,316	4,612
Derivatives (included in other liabilities)	388	333
Total liabilities	5,704	4,945
Gross amounts offset on the balance sheet
Federal funds sold and securities purchased under agreements to resell	(421)	(233)
Derivatives (included in other assets)	0	0
Total assets	(421)	(233)
Federal funds and other short-term borrowings	(421)	(233)
Derivatives (included in other liabilities)	0	0
Total liabilities	(421)	(233)
Net amounts presented on the balance sheet
Federal funds sold and securities purchased under agreements to resell	894	937
Derivatives (included in other assets)	481	420
Total assets	1,375	1,357
Federal funds and other short-term borrowings	4,895	4,379
Derivatives (included in other liabilities)	388	333
Total liabilities	5,283	4,712
Gross amounts not offset in the balance sheet, Financial Instruments
Federal funds sold and securities purchased under agreements to resell	0	0
Derivatives (included in other assets)	(12)	(31)
Total assets	(12)	(31)
Federal funds and other short-term borrowings	0	0
Derivatives (included in other liabilities)	(12)	(31)
Total liabilities	(12)	(31)
Gross amounts not offset in the balance sheet, Cash collateral received/ pledged
Federal funds sold and securities purchased under agreements to resell	0	0
Derivatives (included in other assets)	(455)	(357)
Total assets	(455)	(357)
Federal funds and other short-term borrowings	0	0
Derivatives (included in other liabilities)	0	(1)
Total liabilities	0	(1)
Net amount
Federal funds sold and securities purchased under agreements to resell	894	937
Derivatives (included in other assets)	14	32
Total assets	908	969
Federal funds and other short-term borrowings	4,895	4,379
Derivatives (included in other liabilities)	376	301
Total liabilities	$ 5,271	$ 4,680