Loans and Accounts Receivable (Details 1) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable segment information
Card Member receivables	$ 57,413	$ 55,893
Less: Reserve for losses	619	573	$ 521	$ 467
Card Member receivables, net	56,794	55,320
Variable Interest Entity, Primary Beneficiary [Member]
Accounts receivable segment information
Card Member receivables	8,284	8,539
Global Consumer Services Group [Member]
Accounts receivable segment information
Card Member receivables	22,844	21,455
Global Commercial Services [Member]
Accounts receivable segment information
Card Member receivables	$ 34,569	$ 34,438