Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 3,516	$ 5,004	$ 4,996	$ 5,253
Other comprehensive income (loss) before reclassifications			(78)
Amounts reclassified to earnings			10
Total other comprehensive income (loss), net of tax	18	(116)	(68)	(125)
Ending balance	3,750	4,169	3,750	4,169
Cumulative Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(479)
Other comprehensive income (loss) before reclassifications			(97)
Amounts reclassified to earnings			0
Total other comprehensive income (loss), net of tax			(97)
Ending balance	(576)		(576)
Pension and  Postretirement Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(399)
Other comprehensive income (loss) before reclassifications			(2)
Amounts reclassified to earnings			14
Total other comprehensive income (loss), net of tax			12
Ending balance	(387)		(387)
Derivative Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(42)
Other comprehensive income (loss) before reclassifications			21
Amounts reclassified to earnings			(4)
Total other comprehensive income (loss), net of tax			17
Ending balance	(25)		(25)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,006)	(922)	(920)	(913)
Ending balance	$ (988)	$ (1,038)	$ (988)	$ (1,038)