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Segment Information (Reconciliation of Segment Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	$ 337	$ 406	$ 275	$ 246	$ 199	$ 352	$ 383	$ 262	$ 1,264	$ 1,196	$ 1,096
Restructuring and other									(34)	26	(44)
Goodwill impairment					$ (25)				0	(25)	0
Amortization of intangibles									(180)	(186)	(148)
Loss from early extinguishments of debt									0	(27)	0
Fair value adjustment to inventory									0	0	(40)
Other pension and postretirement									(45)	(13)	25
Interest expense									(300)	(378)	(384)
Interest income									8	17	21
Foreign exchange									(1)	(9)	(18)
Income before income taxes									926	786	740
Intercompany profit related to non-reportable segments									9	6	7
Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income									1,524	1,413	1,345
Operating segments | Other segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill impairment										(25)
Other segments | Other segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income									119	126	122
Corporate and unallocated items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate and unallocated items									$ (165)	$ (158)	$ (139)

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