Commitments, Guarantees, and Contingent Liabilities (Schedule of Off Balance Sheet Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Unfunded lending commitments	$ 28,677	$ 28,940
Commercial letters of credit	19	22
Mortgage-backed security purchase agreement	67	66
Total unfunded lending commitments	29,557	29,782
Financial
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	576	548
Performance
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	$ 218	$ 206