Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 3,900	$ 4,996
Total other comprehensive loss, net of tax	(34)	(135)
Ending balance	3,861	3,479
Cumulative Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(481)
Other comprehensive income (loss) before reclassifications	(44)
Amounts reclassified to earnings	0
Total other comprehensive loss, net of tax	(44)
Ending balance	(525)
Pension and  Postretirement Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(356)
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified to earnings	4
Total other comprehensive loss, net of tax	5
Ending balance	(351)
Derivative Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(43)
Other comprehensive income (loss) before reclassifications	2
Amounts reclassified to earnings	3
Total other comprehensive loss, net of tax	5
Ending balance	(38)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(880)	(920)
Other comprehensive income (loss) before reclassifications	(41)
Amounts reclassified to earnings	7
Total other comprehensive loss, net of tax	(34)
Ending balance	$ (914)	$ (1,055)