Commitments (Other Commitments) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Other Commitments [Line Items]
Commitments	$ 335,570	$ 326,159
Investments to quality for PAM	2,700	3,000
Commitments to extend credit
Other Commitments [Line Items]
Commitments	315,677	307,160
Commitments to extend credit \| Commercial
Other Commitments [Line Items]
Commitments	241,800	236,142
Commitments to extend credit \| Home equity
Other Commitments [Line Items]
Commitments	24,468	23,684
Commitments to extend credit \| Credit card
Other Commitments [Line Items]
Commitments	41,231	39,536
Commitments to extend credit \| Other
Other Commitments [Line Items]
Commitments	8,178	7,798
Standby letters of credit
Other Commitments [Line Items]
Commitments	12,270	11,452
Standby letters of credit \| Remarketing Programs
Other Commitments [Line Items]
Commitments	3,400	3,200
Standby bond purchase agreements
Other Commitments [Line Items]
Commitments	1,051	1,026
Other commitments
Other Commitments [Line Items]
Commitments	$ 6,572	$ 6,521