Accounting Policies - Restricted Cash (Parenthetical) - (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Business Acquisition [Line Items]
Cash and Cash Equivalents		$ 1,030	$ 1,539	$ 1,006
Restricted Cash	[1]	104		$ 32
Cooper Tire
Business Acquisition [Line Items]
Restricted Cash		$ 50

[1] Includes Cooper Tire restricted cash of $50 million at June 30, 2021.