Loans and Card Member Receivables (Details 3) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Impaired loans and receivables
Loans over 90 days past due and accruing interest	$ 238	$ 169
Non-accrual loans	135	96
Loans and receivables modified as a Troubled Debt Restructuring in Program	1,453	1,332
Loans and receivables modified as Troubled Debt Restructuring Out of Program	2,012	1,764
Total impaired loans and receivables	3,838	3,361
Reserve for Credit Losses - TDRs	439	596
Accounts Receivable and Loans Textuals
Total loans and receivables modified as a TDR, past due 90 days and still accruing	45	41
Total loans and receivables modified as a TDR, non-accrual	14	19
Out of Program TDR accounts that completed modification programs	1,900	1,600
Out of Program TDR accounts not in compliance with modification programs	141	143
Card Member Loans | Consumer
Impaired loans and receivables
Loans over 90 days past due and accruing interest	197	149
Non-accrual loans	110	82
Loans and receivables modified as a Troubled Debt Restructuring in Program	672	708
Loans and receivables modified as Troubled Debt Restructuring Out of Program	1,057	997
Total impaired loans and receivables	2,036	1,936
Reserve for Credit Losses - TDRs	302	415
Card Member Loans | Small Business
Impaired loans and receivables
Loans over 90 days past due and accruing interest	38	19
Non-accrual loans	24	14
Loans and receivables modified as a Troubled Debt Restructuring in Program	210	176
Loans and receivables modified as Troubled Debt Restructuring Out of Program	372	332
Total impaired loans and receivables	644	541
Reserve for Credit Losses - TDRs	92	132
Card Member Loans | Corporate
Impaired loans and receivables
Loans over 90 days past due and accruing interest	0	0
Non-accrual loans	0	0
Loans and receivables modified as a Troubled Debt Restructuring in Program	0	0
Loans and receivables modified as Troubled Debt Restructuring Out of Program	0	0
Total impaired loans and receivables	0	0
Reserve for Credit Losses - TDRs	0	0
Card Member Receivables | Consumer
Impaired loans and receivables
Loans over 90 days past due and accruing interest	0	0
Non-accrual loans	0	0
Loans and receivables modified as a Troubled Debt Restructuring in Program	204	133
Loans and receivables modified as Troubled Debt Restructuring Out of Program	171	130
Total impaired loans and receivables	375	263
Reserve for Credit Losses - TDRs	13	9
Card Member Receivables | Small Business
Impaired loans and receivables
Loans over 90 days past due and accruing interest	0	0
Non-accrual loans	0	0
Loans and receivables modified as a Troubled Debt Restructuring in Program	341	247
Loans and receivables modified as Troubled Debt Restructuring Out of Program	405	297
Total impaired loans and receivables	746	544
Reserve for Credit Losses - TDRs	32	39
Card Member Receivables | Corporate
Impaired loans and receivables
Loans over 90 days past due and accruing interest	0	0
Non-accrual loans	0	0
Loans and receivables modified as a Troubled Debt Restructuring in Program	1	1
Loans and receivables modified as Troubled Debt Restructuring Out of Program	6	6
Total impaired loans and receivables	7	7
Reserve for Credit Losses - TDRs	0	0
Other Loans
Impaired loans and receivables
Loans over 90 days past due and accruing interest	3	1
Non-accrual loans	1	0
Loans and receivables modified as a Troubled Debt Restructuring in Program	25	67
Loans and receivables modified as Troubled Debt Restructuring Out of Program	1	2
Total impaired loans and receivables	30	70
Reserve for Credit Losses - TDRs	$ 0	$ 1