Loans and Accounts Receivable (Details 1) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts receivable segment information
Card Member receivables	$ 58,708	$ 55,893
Less: Reserve for losses	616	573	$ 558	$ 521
Card Member receivables, net	58,092	55,320
Other receivables, net	3,173	2,907
Other receivables, reserves	27	25
Variable Interest Entity, Primary Beneficiary [Member]
Accounts receivable segment information
Card Member receivables	7,836	8,539
Global Consumer Services Group [Member]
Accounts receivable segment information
Card Member receivables	21,192	21,455
Global Commercial Services [Member]
Accounts receivable segment information
Card Member receivables	$ 37,516	$ 34,438