Stockholders' Equity - Additional Information (Detail) shares in Millions, $ in Millions	12 Months Ended			36 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($) shares
Stockholders Equity [Line Items]
Stock Repurchase Program, Authorized Amount	$ 1,800			$ 1,800
Treasury Stock, Shares, Acquired | shares				13.0
Treasury Stock, Value, Acquired, Cost Method	113	$ 62	$ 200	$ 375
Option Premiums Paid		16
Stock Repurchase Program, Remaining Authorized Repurchase Amount	76			$ 76
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	8	(3)	(2)
Less: Pension and post-retirement benefits reclassified to earnings, net of tax of $(2), $(1) and $(6), respectively	(6)	$ (6)	(5)
Open Option Contracts Written, Number of Shares | shares		0.6
Proceeds from Issuance of Common Stock	15	$ 0	0
Designated as Hedging Instrument | Foreign Exchange Forward [Member]
Stockholders Equity [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(67)	17	24
Corporate Interest Expense [Member]
Stockholders Equity [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	9	4	3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ 6	$ 3	$ 2