Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Standby Letters of Credit (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Expires in One Year or Less	$ 3,747
Expires After One Year	98
Total Amount Outstanding	3,845
Maximum Amount of Future Payments	3,845
Financial standby letters of credit
Guarantor Obligations [Line Items]
Expires in One Year or Less	3,671
Expires After One Year	92
Total Amount Outstanding	3,763
Maximum Amount of Future Payments	3,763
Performance standby letters of credit
Guarantor Obligations [Line Items]
Expires in One Year or Less	76
Expires After One Year	6
Total Amount Outstanding	82
Maximum Amount of Future Payments	82
Standby letters of credit
Guarantor Obligations [Line Items]
Deferred fees	$ 20	$ 20