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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 576	$ 593
Accumulated Amortization	(570)	(585)
Net Carrying Amount	6	8
Customer lists and user base
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	189	203
Accumulated Amortization	(189)	(203)
Net Carrying Amount	$ 0	$ 0
Weighted Average Useful Life (Years)	0 years	0 years
Marketing related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 55	$ 57
Accumulated Amortization	(52)	(52)
Net Carrying Amount	$ 3	$ 5
Weighted Average Useful Life (Years)	2 years	2 years
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 173	$ 174
Accumulated Amortization	(173)	(174)
Net Carrying Amount	$ 0	$ 0
Weighted Average Useful Life (Years)	0 years	0 years
All other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 159	$ 159
Accumulated Amortization	(156)	(156)
Net Carrying Amount	$ 3	$ 3
Weighted Average Useful Life (Years)	3 years	3 years

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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- Definition

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
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
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