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Segment and Geographic Information - Summary of Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue (Note 4)	$ 335	$ 428	$ 422	$ 376	$ 346	$ 458	$ 433	$ 378	$ 1,560	[1]	$ 1,615	[1]	$ 1,556
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue (Note 4)									821		835		802
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue (Note 4)									466		508		530
All Other Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue (Note 4)									$ 273		$ 272		$ 224
[1] Our revenue is recognized primarily at a point in time for all reported segments

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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+ References

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