Loans and Accounts Receivable (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Average balance of impaired loans	$ 1,530	$ 1,134	$ 884
Interest income recognized	161	130	102
Global Consumer Services Group [Member] | Card Member Loans [Member]
Financing Receivable, Impaired [Line Items]
Average balance of impaired loans	1,159	878	699
Interest income recognized	136	109	85
Global Consumer Services Group [Member] | Card Member Receivables [Member]
Financing Receivable, Impaired [Line Items]
Average balance of impaired loans	56	33	20
Interest income recognized	0	0	0
Global Commercial Services [Member] | Card Member Loans [Member]
Financing Receivable, Impaired [Line Items]
Average balance of impaired loans	203	150	120
Interest income recognized	25	21	17
Global Commercial Services [Member] | Card Member Receivables [Member]
Financing Receivable, Impaired [Line Items]
Average balance of impaired loans	112	73	45
Interest income recognized	$ 0	$ 0	$ 0