Loans and Interest Receivable - Allowance for Loans and Interest Receivable (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Consumer Receivables
Allowance for loans and interest receivable
Beginning balance	$ 352	$ 57
Provisions	8	118
Charge-offs	(24)	(20)
Recoveries	5	9
Other	3	(5)
Ending balance	344	187
Consumer Receivables \| Installment Loans Receivable
Allowance for loans and interest receivable
Beginning balance	299	49
Provisions	6	98
Charge-offs	(20)	(17)
Recoveries	5	9
Other	2	(4)
Ending balance	292	159
Consumer Receivables \| Interest and Fees Receivable
Allowance for loans and interest receivable
Beginning balance	53	8
Provisions	2	20
Charge-offs	(4)	(3)
Recoveries	0	0
Other	1	(1)
Ending balance	52	28
Consumer Receivables \| Other Consumer Credit Products
Allowance for loans and interest receivable
Ending balance	3	10
Merchant Receivables
Allowance for loans and interest receivable
Beginning balance	483	191
Provisions	(17)	267
Charge-offs	(77)	(86)
Recoveries	8	3
Ending balance	397	557
Merchant Receivables \| Installment Loans Receivable
Allowance for loans and interest receivable
Beginning balance	440	171
Provisions	(15)	243
Charge-offs	(71)	(78)
Recoveries	8	3
Ending balance	362	504
Merchant Receivables \| Interest and Fees Receivable
Allowance for loans and interest receivable
Beginning balance	43	20
Provisions	(2)	24
Charge-offs	(6)	(8)
Recoveries	0	0
Ending balance	35	53
Cumulative Effect, Period Of Adoption, Adjustment \| Consumer Receivables
Allowance for loans and interest receivable
Beginning balance	0	28
Cumulative Effect, Period Of Adoption, Adjustment \| Consumer Receivables \| Installment Loans Receivable
Allowance for loans and interest receivable
Beginning balance	0	24
Cumulative Effect, Period Of Adoption, Adjustment \| Consumer Receivables \| Interest and Fees Receivable
Allowance for loans and interest receivable
Beginning balance	0	4
Cumulative Effect, Period Of Adoption, Adjustment \| Merchant Receivables
Allowance for loans and interest receivable
Beginning balance	0	182
Cumulative Effect, Period Of Adoption, Adjustment \| Merchant Receivables \| Installment Loans Receivable
Allowance for loans and interest receivable
Beginning balance	0	165
Cumulative Effect, Period Of Adoption, Adjustment \| Merchant Receivables \| Interest and Fees Receivable
Allowance for loans and interest receivable
Beginning balance	$ 0	$ 17

Amount of foreign currency translation gain (loss) which (increases) decreases allowance for credit loss on financing receivable.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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Balance Type:	debit
Period Type:	duration

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
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-Paragraph 13
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-Publisher FASB
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Period Type:	duration

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