Costs Associated with Rationalization Programs - Narrative (Details) $ in Millions		3 Months Ended		6 Months Ended
	Mar. 18, 2019 facility position	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) employee	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of facilities affected | facility	2
Expected number of positions eliminated | employee				1,100
Rationalizations		$ 4	$ (2)	$ 107	$ 35
Rationalizations accrual balance		155		155		$ 81
Rationalization reversals			7	2	12
Rationalization charges incurred to date						$ 720
Rationalization charges expected to be incurred in future periods		45		45
Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations		1	(3)	$ 4	3
Number of positions eliminated | employee				250
Current Year Plans
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | employee				1,050
Rationalizations		3	1	$ 103	32
Number of positions eliminated | employee				250
Modernizing Tire Manufacturing Facilities in Germany
Restructuring Cost and Reserve [Line Items]
Number of facilities affected | facility	2
Expected number of positions eliminated | position	1,100
Modernizing Tire Manufacturing Facilities in Germany | Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations		1		$ 94
Europe, Middle East, and Africa Restructuring Plan - Manufacturing Employee Severance and Operating Efficiency
Restructuring Cost and Reserve [Line Items]
Rationalizations accrual balance		31		31
Europe, Middle East, and Africa Restructuring Plan - Manufacturing Employee Severance and Operating Efficiency | Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations		1		6
Employee Severance
Restructuring Cost and Reserve [Line Items]
Rationalizations accrual balance		22		22
Employee Severance | Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations			1		26
Americas Restructuring Plan - Manufacturing Employee Severance and Operating Efficiency
Restructuring Cost and Reserve [Line Items]
Rationalizations accrual balance		5		5
Americas Restructuring Plan - Manufacturing Employee Severance and Operating Efficiency | Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations		$ 2		$ 9
Europe, Middle East, and Africa Restructuring Plan - Operating Efficiency | Current Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations					6
Philippsburg Restructuring | Prior Year Plans
Restructuring Cost and Reserve [Line Items]
Rationalizations			$ 2		$ 9
Amiens Restructuring Plan | Amiens Labor Claims
Restructuring Cost and Reserve [Line Items]
Loss contingency, number of plaintiffs | employee				850