Accounting Policies - Narrative (Details) $ / shares in Units, $ in Millions		3 Months Ended
	Feb. 22, 2021 $ / shares	Mar. 31, 2021 USD ($)	Mar. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date		Jan. 31, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]		true
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201409Member
Expense related to valuation of inventory | $		$ 20
Merger Agreement | Cooper Tire
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Entitled to receive cash per share | $ / shares	$ 41.75
Fixed exchange ratio of share	0.907