Other Fees and Commissions and Other Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fees charged to Card Members:
Delinquency fees	$ 637	$ 772	$ 1,028
Foreign currency conversion fee revenue	523	433	982
Other customer fees:
Loyalty coalition-related fees	508	435	456
Travel commissions and fees	244	102	424
Service fees and other	480	421	407
Other fees and commissions
Other customer fees:
Total Other fees and commissions	$ 2,392	$ 2,163	$ 3,297