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Summary of Significant Accounting Policies - Cloud-Hosted Arrangements (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Implementation costs, gross	$ 76	$ 67
Accumulated amortization	(29)	(13)
Implementation costs, net	$ 47	$ 54

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Amount of accumulated amortization of capitalized implementation cost from hosting arrangement that is service contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 40
-Section 50
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Amount, after accumulated amortization, of capitalized implementation cost from hosting arrangement that is service contract.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount, before accumulated amortization, of capitalized implementation cost from hosting arrangement that is service contract.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=118198657&loc=SL118198666-228104

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