Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Standby Letters of Credit (Details) $ in Millions	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Expires In One Year or Less	$ 3,492
Expires After One Year	120
Total Amount Outstanding	3,612
Maximum Amount of Future Payments	3,612
Financial standby letters of credit
Loss Contingencies [Line Items]
Expires In One Year or Less	3,390
Expires After One Year	113
Total Amount Outstanding	3,503
Maximum Amount of Future Payments	3,503
Performance standby letters of credit
Loss Contingencies [Line Items]
Expires In One Year or Less	102
Expires After One Year	7
Total Amount Outstanding	109
Maximum Amount of Future Payments	$ 109