Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Restructuring reserve beginning balance			$ 54
Cash payments			(32)
Restructuring charges	$ 5	$ 105	14	$ 144
Other			(15)
Restructuring reserve ending balance	21		21
Settlements	3	64	6	64
Restructuring and other charges	5	105	14	144
Gain (loss) on sale of assets			3
Small Manufacturing Business
Restructuring Reserve [Roll Forward]
Restructuring charges			6
Restructuring and other charges			6
Pension benefits
Restructuring Reserve [Roll Forward]
Settlements	3	$ 64	6	$ 64
Layoff costs
Restructuring Reserve [Roll Forward]
Restructuring reserve beginning balance			54
Cash payments			(32)
Restructuring charges			7
Other			(8)
Restructuring reserve ending balance	21		21
Restructuring and other charges			7
Other exit costs
Restructuring Reserve [Roll Forward]
Restructuring reserve beginning balance			0
Cash payments			0
Restructuring charges			7
Other			(7)
Restructuring reserve ending balance	$ 0		0
Restructuring and other charges			7
Other Layoffs Costs
Restructuring Reserve [Roll Forward]
Restructuring charges			2
Restructuring and other charges			2
Facility closing | Small Manufacturing Business
Restructuring Reserve [Roll Forward]
Restructuring charges			4
Restructuring and other charges			$ 4