Funds Receivable and Customer Accounts and Investments - Measurement Alternative Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Equity Securities without Readily Determinable Fair Value [Roll Forward]
Carrying amount, beginning of period	$ 779	$ 497
Adjustments related to non-marketable equity securities:
Net additions (sales)	10	(9)
Gross unrealized gains	12	45
Gross unrealized losses and impairments	0	(13)
Carrying amount, end of period	$ 801	$ 520

Equity Securities Without Readily Determinable Fair Value, Net Additions (Sales)

No definition available.

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- Definition

Equity Securities without Readily Determinable Fair Value [Roll Forward]

+ References

No definition available.

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714

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- References

No definition available.

+ Details

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- Definition

Amount of impairment loss on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714

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- Definition

Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714

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