Costs Associated with Rationalization Programs - Net Rationalization Charges Included in Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Rationalizations	$ 4	$ (2)	$ 107	$ 35
Asset Write-off and Accelerated Depreciation Charges	1	1	1	2
Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	3	1	103	32
Current Year Plans | Associate Severance and Other Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	0	1	98	32
Current Year Plans | Benefit Plan Termination Benefits
Restructuring Cost and Reserve [Line Items]
Rationalizations	0	0	1	0
Current Year Plans | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	3	0	4	0
Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	1	(3)	4	3
Prior Year Plans | Associate Severance and Other Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	0	(6)	0	(8)
Prior Year Plans | Benefit Plan Termination Benefits
Restructuring Cost and Reserve [Line Items]
Rationalizations	(1)	0	(1)	0
Prior Year Plans | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	$ 2	$ 3	$ 5	$ 11