Stockholders' Equity (Narrative) (Detail) - USD ($) shares in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stockholders Equity [Line Items]
Currency translation adjustments (net of tax of $5 and $3, respectively) (b)	$ 1,000,000	$ 25,000,000
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants	$ 100
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax	$ 6,000,000	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	1,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	6,000,000	$ 1,000,000
Stock Repurchase Program, Authorized Amount	1,500,000,000
Stock Repurchased During Period, Shares		1.5
Stock Repurchased During Period, Value		$ 50,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	100,000,000
Selling, General and Administrative Expenses [Member]
Stockholders Equity [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	2,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	$ 1,000,000