Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 3,775	$ 3,421	$ 3,601	$ 3,508
Other comprehensive income (loss):
Total Other comprehensive loss, net of tax	(42)	(119)	(9)	(248)
Ending balance	3,872	3,273	3,872	3,273
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,808)	(1,992)	(1,841)	(1,863)
Other comprehensive income (loss):
Total Other comprehensive loss, net of tax	(42)	(119)	(9)	(248)
Ending balance	(1,850)	(2,111)	(1,850)	(2,111)
Pension and other postretirement benefits (E)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(644)	(767)	(653)	(799)
Other comprehensive income (loss):
Other comprehensive gain (loss) income, before reclassifications, before tax	7	(3)	7	13
Tax income (expense)	(1)	0	(1)	(3)
Total Other comprehensive income (loss) before reclassifications, net of tax	6	(3)	6	10
Amortization of net actuarial loss and prior service cost and net amount reclassified to earnings	5	13	17	38
Tax expense	(1)	(3)	(4)	(9)
Total amount reclassified from Accumulated other comprehensive income (loss), net of tax	4	10	13	29
Total Other comprehensive loss, net of tax	10	7	19	39
Ending balance	(634)	(760)	(634)	(760)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,155)	(1,207)	(1,193)	(1,062)
Other comprehensive income (loss):
Total Other comprehensive loss, net of tax	(56)	(128)	(18)	(273)
Ending balance	(1,211)	(1,335)	(1,211)	(1,335)
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(9)	(18)	5	(2)
Other comprehensive income (loss):
Other comprehensive gain (loss) income, before reclassifications, before tax	1	(6)	(13)	(17)
Tax income (expense)	0	2	3	4
Total Other comprehensive income (loss) before reclassifications, net of tax	1	(4)	(10)	(13)
Amortization of net actuarial loss and prior service cost and net amount reclassified to earnings	4	9	0	(1)
Tax expense	(1)	(3)	0	0
Total amount reclassified from Accumulated other comprehensive income (loss), net of tax	3	6	0	(1)
Total Other comprehensive loss, net of tax	4	2	(10)	(14)
Ending balance	$ (5)	$ (16)	$ (5)	$ (16)