Accounting Policies - Restricted Cash (Parenthetical) - (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Business Acquisition [Line Items]
Cash and Cash Equivalents		$ 1,187	$ 1,539	$ 1,057
Restricted Cash	[1]	71		$ 72
Cooper Tire
Business Acquisition [Line Items]
Restricted Cash		$ 26

[1] Includes remaining Cooper Tire restricted cash acquired of $26 million at September 30, 2021.