Stockholders' Equity - Additional Information (Detail) shares in Millions, $ in Millions	6 Months Ended	12 Months Ended			36 Months Ended
	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) shares
Stockholders Equity [Line Items]
Stock Repurchase Program, Authorized Amount		$ 1,800			$ 1,800
Treasury Stock, Shares, Acquired | shares					14.0
Treasury Stock, Value, Acquired, Cost Method		62	$ 200	$ 200	$ 462
Option Premiums Paid	$ 16
Stock Repurchase Program, Remaining Authorized Repurchase Amount		189			$ 189
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		(3)	(2)	2
Less: Pension and post-retirement benefits reclassified to earnings, net of tax of $(2), $(1) and $(6), respectively		(6)	(5)	(5)
Open Option Contracts Written, Number of Shares | shares	0.6
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		17	24	(50)
Corporate Interest Expense [Member]
Stockholders Equity [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		4	3	4
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		$ 3	$ 2	$ 2