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Goodwill and Intangible Assets - Components of Identifiable Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,969	$ 2,975
Accumulated Amortization	(2,031)	(1,927)
Net Carrying Amount	938	1,048
Customer lists and user base
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,201	1,206
Accumulated Amortization	(822)	(797)
Net Carrying Amount	$ 379	$ 409
Weighted Average Useful Life (Years)	6 years	6 years
Marketing related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 321	$ 321
Accumulated Amortization	(289)	(278)
Net Carrying Amount	$ 32	$ 43
Weighted Average Useful Life (Years)	3 years	3 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 999	$ 999
Accumulated Amortization	(638)	(577)
Net Carrying Amount	$ 361	$ 422
Weighted Average Useful Life (Years)	3 years	3 years
All other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 448	$ 449
Accumulated Amortization	(282)	(275)
Net Carrying Amount	$ 166	$ 174
Weighted Average Useful Life (Years)	7 years	7 years

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Topic 350
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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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