Loans and Interest Receivable - Schedule of Allowance for Loans and Interest Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consumer Receivables
Allowance for loans and interest receivable
Beginning balance	$ 30	$ 63
Provisions	45	61
Charge-offs	(49)	(115)
Recoveries	31	21
Ending balance	57	30
Consumer Receivables | U.S.
Allowance for loans and interest receivable
Consumer loans and interest receivable not designated as held for sale and are expected to be charged off			$ 50
Merchant Receivables
Allowance for loans and interest receivable
Beginning balance	130	59
Provisions	266	182
Charge-offs	(222)	(121)
Recoveries	17	10
Ending balance	191	130
Loans Receivable | Consumer Receivables
Allowance for loans and interest receivable
Beginning balance	27	57
Provisions	34	53
Charge-offs	(43)	(104)
Recoveries	31	21
Ending balance	49	27
Loans Receivable | Merchant Receivables
Allowance for loans and interest receivable
Beginning balance	115	52
Provisions	240	162
Charge-offs	(201)	(109)
Recoveries	17	10
Ending balance	171	115
Interest & Fees Receivable | Consumer Receivables
Allowance for loans and interest receivable
Beginning balance	3	6
Provisions	11	8
Charge-offs	(6)	(11)
Recoveries	0	0
Ending balance	8	3
Interest & Fees Receivable | Merchant Receivables
Allowance for loans and interest receivable
Beginning balance	15	7
Provisions	26	20
Charge-offs	(21)	(12)
Recoveries	0	0
Ending balance	$ 20	$ 15