Costs Associated with Rationalization Programs - Net Rationalization Charges Included in Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Rationalizations	$ 103	$ 37
Asset Write-off and Accelerated Depreciation Charges	0	1
Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	100	31
Current Year Plans | Associate Severance and Other Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	98	31
Current Year Plans | Benefit Plan Termination Benefits
Restructuring Cost and Reserve [Line Items]
Rationalizations	1	0
Current Year Plans | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	1	0
Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	3	6
Prior Year Plans | Associate Severance and Other Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	0	(2)
Prior Year Plans | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	$ 3	$ 8