Loans and Accounts Receivable (Details 1) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Accounts receivable segment information
Card Member receivables	$ 56,625	$ 55,893
Less: Reserve for losses	615	573	$ 544	$ 521
Card Member receivables, net	56,010	55,320
Other receivables, net	2,846	2,907
Other receivables, reserves	22	25
Variable Interest Entity, Primary Beneficiary [Member]
Accounts receivable segment information
Card Member receivables	7,492	8,539
Global Consumer Services Group [Member]
Accounts receivable segment information
Card Member receivables	20,684	21,455
Global Commercial Services [Member]
Accounts receivable segment information
Card Member receivables	$ 35,941	$ 34,438