Commitments, Contingent Liabilities and Guarantees - Commitments to Extend Credit or Funding (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Guarantor Obligations [Line Items]
Total loan commitments	$ 73,899	$ 66,141
Commercial letters of credit	79	74
Purchase card commitments	771	708
Principal investing commitments	12	16
Tax credit investment commitments	679	487
Total loan and other commitments	75,440	67,426
Commercial and other
Guarantor Obligations [Line Items]
Total loan commitments	54,614	47,792
Commercial real estate and construction
Guarantor Obligations [Line Items]
Total loan commitments	3,180	2,365
Home equity
Guarantor Obligations [Line Items]
Total loan commitments	8,888	9,299
Credit cards
Guarantor Obligations [Line Items]
Total loan commitments	$ 7,217	$ 6,685