Costs Associated with Rationalization Programs - Net Rationalization Charges Included in Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Rationalizations	$ 5	$ 46	$ 40	$ 102
Asset Write-off and Accelerated Depreciation Charges	0	10	2	39
Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	1	26	33	52
Current Year Plans | Associate Severance and Other Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	0	26	32	51
Current Year Plans | Other Exit and Non-Cancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	1	0	1	1
Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations	4	20	7	50
Prior Year Plans | Associate Severance and Other Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	1	(5)	(6)	12
Prior Year Plans | Pension Curtailment
Restructuring Cost and Reserve [Line Items]
Rationalizations	0	13	0	14
Prior Year Plans | Other Exit and Non-Cancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations	$ 3	$ 12	$ 13	$ 24