Loans and Card Member Receivables (Details 1) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable segment information
Card Member receivables	$ 37,553,000,000	$ 57,413,000,000
Less: Reserve for credit losses	519,000,000	619,000,000
Card Member receivables, net	37,034,000,000	56,794,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Accounts receivable segment information
Card Member receivables	4,042,000,000	8,284,000,000
Global Consumer Services Group [Member]
Accounts receivable segment information
Card Member receivables	14,977,000,000	22,844,000,000
Global Consumer Services Group [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Accounts receivable segment information
Card Member receivables	0	8,300,000,000
Global Commercial Services [Member]
Accounts receivable segment information
Card Member receivables	22,576,000,000	34,569,000,000
Global Commercial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Accounts receivable segment information
Card Member receivables	$ 4,000,000,000.0	$ 0