Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Standby Letters of Credit (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Expires in One Year or Less	$ 3,695
Expires After One Year	148
Total Amount Outstanding	3,843
Maximum Amount of Future Payments	3,843
Financial standby letters of credit
Guarantor Obligations [Line Items]
Expires in One Year or Less	3,621
Expires After One Year	140
Total Amount Outstanding	3,761
Maximum Amount of Future Payments	3,761
Performance standby letters of credit
Guarantor Obligations [Line Items]
Expires in One Year or Less	74
Expires After One Year	8
Total Amount Outstanding	82
Maximum Amount of Future Payments	82
Standby letters of credit
Guarantor Obligations [Line Items]
Deferred fees	$ 18	$ 20