Loans and Card Member Receivables (Details 4) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Impaired loans and receivables
Loans over 90 days past due and accruing interest	$ 309	$ 169	$ 226
Non-accrual loans	191	96	176
Loans and receivables modified as a Troubled Debt Restructuring in Program	1,733	1,332	3,086
Loans and receivables modified as Troubled Debt Restructuring Out of Program	2,068	1,764	430
Total impaired loans and receivables	4,301	3,361	3,918
Reserve for Credit Losses - TDRs	504	596	1,346
Accounts Receivable and Loans Textuals
Total loans and receivables modified as a TDR, past due 90 days and still accruing	48	41	32
Total loans and receivables modified as a TDR, non-accrual	17	19	11
Out of Program TDR accounts that completed modification programs	1,922	1,621	316
Out of Program TDR accounts not in compliance with modification programs	146	143	114
Card Member loans | Consumer
Impaired loans and receivables
Loans over 90 days past due and accruing interest	252	149	203
Non-accrual loans	155	82	146
Loans and receivables modified as a Troubled Debt Restructuring in Program	781	708	1,586
Loans and receivables modified as Troubled Debt Restructuring Out of Program	1,098	997	248
Total impaired loans and receivables	2,286	1,936	2,183
Reserve for Credit Losses - TDRs	335	415	782
Card Member loans | Small Business
Impaired loans and receivables
Loans over 90 days past due and accruing interest	54	19	21
Non-accrual loans	34	14	29
Loans and receivables modified as a Troubled Debt Restructuring in Program	267	176	478
Loans and receivables modified as Troubled Debt Restructuring Out of Program	380	332	67
Total impaired loans and receivables	735	541	595
Reserve for Credit Losses - TDRs	108	132	285
Card Member loans | Corporate
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	0	0	0
Loans and receivables modified as Troubled Debt Restructuring Out of Program	0	0	0
Total impaired loans and receivables	0	0	0
Reserve for Credit Losses - TDRs	0	0	0
Card Member receivables | Consumer
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	257	133	240
Loans and receivables modified as Troubled Debt Restructuring Out of Program	179	130	34
Total impaired loans and receivables	436	263	274
Reserve for Credit Losses - TDRs	20	9	60
Card Member receivables | Small Business
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	403	247	516
Loans and receivables modified as Troubled Debt Restructuring Out of Program	402	297	73
Total impaired loans and receivables	805	544	589
Reserve for Credit Losses - TDRs	40	39	136
Card Member receivables | Corporate
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	6	1	18
Loans and receivables modified as Troubled Debt Restructuring Out of Program	7	6	2
Total impaired loans and receivables	13	7	20
Reserve for Credit Losses - TDRs	1	0	3
Other
Impaired loans and receivables
Loans over 90 days past due and accruing interest	3	1	2
Non-accrual loans	2	0	1
Loans and receivables modified as a Troubled Debt Restructuring in Program	19	67	248
Loans and receivables modified as Troubled Debt Restructuring Out of Program	2	2	6
Total impaired loans and receivables	26	70	257
Reserve for Credit Losses - TDRs	$ 0	$ 1	$ 80