Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 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	$ (128)	$ 57	(129)	$ 59
Ending balance	3,421		3,421
Accumulated other comprehensive loss
Other comprehensive income:
Total Other comprehensive (loss) income, net of tax	(128)	57	(129)	59
Ending balance	(1,992)	(1,884)	(1,992)	(1,884)
Pension and other postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(789)	(938)	(799)	(980)
Other comprehensive income:
Unrecognized net actuarial gain and prior service cost/benefit	15	30	16	67
Tax expense	(3)	(7)	(3)	(15)
Total Other comprehensive (loss) income before reclassifications, net of tax	12	23	13	52
Amortization of net actuarial loss and prior service cost	13	15	25	31
Tax benefit (expense)	(3)	(3)	(6)	(6)
Total amount reclassified from Accumulated other comprehensive loss, net of tax	10	12	19	25
Total Other comprehensive (loss) income, net of tax	22	35	32	77
Ending balance	(767)	(903)	(767)	(903)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,093)	(1,010)	(1,062)	(966)
Other comprehensive income:
Total Other comprehensive (loss) income, net of tax	(114)	18	(145)	(26)
Ending balance	(1,207)	(992)	(1,207)	(992)
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	18	7	(2)	3
Other comprehensive income:
Unrecognized net actuarial gain and prior service cost/benefit	(36)	11	(11)	19
Tax expense	8	(2)	2	(4)
Total Other comprehensive (loss) income before reclassifications, net of tax	(28)	9	(9)	15
Amortization of net actuarial loss and prior service cost	(11)	(5)	(10)	(8)
Tax benefit (expense)	3	0	3	1
Total amount reclassified from Accumulated other comprehensive loss, net of tax	(8)	(5)	(7)	(7)
Total Other comprehensive (loss) income, net of tax	(36)	4	(16)	8
Ending balance	$ (18)	$ 11	$ (18)	$ 11