Customer Deposits (Details 1) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deposits By Type
Savings and transaction accounts	$ 66,142	$ 63,512
Certificates of deposit:
Direct	1,415	2,440
Third-party (brokered)	3,095	5,561
Sweep accounts ―Third-party (brokered)	12,658	14,070
Other deposits	42	45
Card Member credit balances	1,030	1,247
Total customer deposits	$ 84,382	$ 86,875