Description of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions		3 Months Ended								12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Revenues		$ 626	$ 526	$ 513	$ 491	$ 626	$ 552	$ 599	$ 545	$ 2,156	$ 2,322	$ 2,530
Depreciation										$ 55	$ 49	$ 53
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares)										127.8		141.9
Decrease in weighted average dilutes shares (in shares)										(125.8)	(131.5)	(139.6)
Operating (loss) income		$ 59	$ 7	$ (1)	$ (1)	$ 98	$ 89	$ 87	$ (42)	$ 64	$ 232	$ (195)
Internal-Use Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Period capitalized on a straight-line basis when the asset is substantially ready for use										3 years
Capitalized Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortizable period										4 years
Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Fees payment term (in days)										30 days
Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Fees payment term (in days)										90 days
Equipment | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated Useful lives (in years)										3 years
Equipment | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated Useful lives (in years)										20 years
Building | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated Useful lives (in years)										25 years
Building | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated Useful lives (in years)										45 years
Employee Stock Option
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares)										2.7	5.2	4.5
New Accounting Pronouncement, Early Adoption, Effect
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Other income										$ 4	$ 3
Operating (loss) income										$ 4	$ 3
Subscription License | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract terms (in years)										1 year
Subscription License | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract terms (in years)										5 years
Software and Cloud Services | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract terms (in years)										1 year
Software and Cloud Services | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract terms (in years)										5 years
Rentals | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract terms (in years)										1 year
Rentals | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract terms (in years)										3 years
Utility Model | Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract terms (in years)										1 year
Utility Model | Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract terms (in years)										5 years
Scenario, Forecast | Accounting Standards Update 2014-09
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Revenues	$ 20
Deferred compensation expense	$ 15