Loans and Card Member Receivables (Details 3) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Impaired loans and receivables
Loans over 90 days past due and accruing interest	$ 195	$ 169
Non-accrual loans	102	96
Loans and receivables modified as a Troubled Debt Restructuring in Program	1,287	1,332
Loans and receivables modified as Troubled Debt Restructuring Out of Program	1,871	1,764
Total impaired loans and receivables	3,455	3,361
Reserve for Credit Losses - TDRs	437	596
Accounts Receivable and Loans Textuals
Total loans and receivables modified as a TDR, past due 90 days and still accruing	46	41
Total loans and receivables modified as a TDR, non-accrual	15	19
Out of Program TDR accounts that completed modification programs	1,719	1,621
Out of Program TDR accounts not in compliance with modification programs	152	143
Other Loans
Impaired loans and receivables
Loans over 90 days past due and accruing interest	1	1
Non-accrual loans	1	0
Loans and receivables modified as a Troubled Debt Restructuring in Program	48	67
Loans and receivables modified as Troubled Debt Restructuring Out of Program	1	2
Total impaired loans and receivables	51	70
Reserve for Credit Losses - TDRs	0	1
GCSG | Card Member Loans
Impaired loans and receivables
Loans over 90 days past due and accruing interest	170	149
Non-accrual loans	84	82
Loans and receivables modified as a Troubled Debt Restructuring in Program	644	708
Loans and receivables modified as Troubled Debt Restructuring Out of Program	1,015	997
Total impaired loans and receivables	1,913	1,936
Reserve for Credit Losses - TDRs	315	415
GCSG | Card Member Receivables
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	144	133
Loans and receivables modified as Troubled Debt Restructuring Out of Program	144	130
Total impaired loans and receivables	288	263
Reserve for Credit Losses - TDRs	8	9
GCS | Card Member Loans
Impaired loans and receivables
Loans over 90 days past due and accruing interest	24	19
Non-accrual loans	17	14
Loans and receivables modified as a Troubled Debt Restructuring in Program	175	176
Loans and receivables modified as Troubled Debt Restructuring Out of Program	352	332
Total impaired loans and receivables	568	541
Reserve for Credit Losses - TDRs	88	132
GCS | Card Member Receivables
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	276	248
Loans and receivables modified as Troubled Debt Restructuring Out of Program	359	303
Total impaired loans and receivables	635	551
Reserve for Credit Losses - TDRs	$ 26	$ 39