Commitments, Contingent Liabilities and Guarantees - Standby and Commercial Letters of Credit, Conditional Commitments Issued to Guarantee the Performance of a Customer to a Third Party (Details) - Letters of credit $ in Millions	Mar. 31, 2024 USD ($)
Line of Credit Facility
Commitments	$ 2,017
Less than 1 year
Line of Credit Facility
Commitments	1,003
Less than 1 year | Commercial
Line of Credit Facility
Commitments	7
1 - 5 years
Line of Credit Facility
Commitments	1,010
1 - 5 years | Commercial
Line of Credit Facility
Commitments	3
Over 5 years
Line of Credit Facility
Commitments	$ 4