Other Assets and Investments (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Dividends received from consolidated subsidiaries		$ 155	$ 43	$ 608
Dividends received from affiliates accounted for using the equity method		5	4	5
Net Income (Loss)		(1,250)	(297)	708
Trade receivable from a customer refinanced		$ 30
TireHub
Accounts Notes And Loans Receivable [Line Items]
Equity ownership percentage		50.00%
Net Income (Loss)		$ 36	33	$ 15
Non-cash impairment charge	$ 148
TireHub | Other Assets
Accounts Notes And Loans Receivable [Line Items]
Equity method investments		77	$ 262
Loan receivable, outstanding		$ 14