Loans and Card Member Receivables (Details 4) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Impaired loans and receivables
Loans over 90 days past due and accruing interest	$ 169	$ 226	$ 428
Non-accrual loans	96	176	338
Loans and receivables modified as a Troubled Debt Restructuring in Program	1,332	3,086	762
Loans and receivables modified as Troubled Debt Restructuring Out of Program	1,764	430	259
Total impaired loans and receivables	3,361	3,918	1,787
Reserve for Credit Losses - TDRs	596	1,346	168
Accounts Receivable and Loans Textuals
Total loans and receivables modified as a TDR, past due 90 days and still accruing	41	32	26
Total loans and receivables modified as a TDR, non-accrual	19	11	10
Out of Program TDR accounts that completed modification programs	1,621	316	188
Out of Program TDR accounts not in compliance with modification programs	143	114	72
Other
Impaired loans and receivables
Loans over 90 days past due and accruing interest	1	2
Non-accrual loans	0	1
Loans and receivables modified as a Troubled Debt Restructuring in Program	67	248
Loans and receivables modified as Troubled Debt Restructuring Out of Program	2	6
Total impaired loans and receivables	70	257
Reserve for Credit Losses - TDRs	1	80
Global Consumer Services Group | Card Member loans
Impaired loans and receivables
Loans over 90 days past due and accruing interest	149	203	384
Non-accrual loans	82	146	284
Loans and receivables modified as a Troubled Debt Restructuring in Program	708	1,586	500
Loans and receivables modified as Troubled Debt Restructuring Out of Program	997	248	175
Total impaired loans and receivables	1,936	2,183	1,343
Reserve for Credit Losses - TDRs	415	782	137
Global Consumer Services Group | Card Member receivables
Impaired loans and receivables
Loans over 90 days past due and accruing interest	0	0	0
Non-accrual loans	0	0	0
Loans and receivables modified as a Troubled Debt Restructuring in Program	133	240	56
Loans and receivables modified as Troubled Debt Restructuring Out of Program	130	34	16
Total impaired loans and receivables	263	274	72
Reserve for Credit Losses - TDRs	9	60	3
Global Commercial Services | Card Member loans
Impaired loans and receivables
Loans over 90 days past due and accruing interest	19	21	44
Non-accrual loans	14	29	54
Loans and receivables modified as a Troubled Debt Restructuring in Program	176	478	97
Loans and receivables modified as Troubled Debt Restructuring Out of Program	332	67	38
Total impaired loans and receivables	541	595	233
Reserve for Credit Losses - TDRs	132	285	22
Global Commercial Services | Card Member receivables
Impaired loans and receivables
Loans over 90 days past due and accruing interest	0	0	0
Non-accrual loans	0	0	0
Loans and receivables modified as a Troubled Debt Restructuring in Program	248	534	109
Loans and receivables modified as Troubled Debt Restructuring Out of Program	303	75	30
Total impaired loans and receivables	551	609	139
Reserve for Credit Losses - TDRs	$ 39	$ 139	$ 6