Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 3,508
Other comprehensive income:
Total Other comprehensive (loss) income, net of tax	(1)	$ 2
Ending balance	3,457
Accumulated other comprehensive loss
Other comprehensive income:
Total Other comprehensive (loss) income, net of tax	(1)	2
Ending balance	(1,864)	(1,941)
Pension and other postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(799)	(980)
Other comprehensive income:
Unrecognized net actuarial gain and prior service cost/benefit	1	37
Tax expense	0	(8)
Total Other comprehensive income before reclassifications, net of tax	1	29
Net amount reclassified to earnings	12	16
Tax benefit (expense)	(3)	(3)
Total amount reclassified from Accumulated other comprehensive loss, net of tax	9	13
Total Other comprehensive (loss) income, net of tax	10	42
Ending balance	(789)	(938)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,062)	(966)
Other comprehensive income:
Total Other comprehensive (loss) income, net of tax	(31)	(44)
Ending balance	(1,093)	(1,010)
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2)	3
Other comprehensive income:
Unrecognized net actuarial gain and prior service cost/benefit	25	8
Tax expense	(6)	(2)
Total Other comprehensive income before reclassifications, net of tax	19	6
Net amount reclassified to earnings	1	(3)
Tax benefit (expense)	0	1
Total amount reclassified from Accumulated other comprehensive loss, net of tax	1	(2)
Total Other comprehensive (loss) income, net of tax	20	4
Ending balance	$ 18	$ 7