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Contingencies (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
item
Income Tax Uncertainties [Abstract]      
Number of subsidiaries assessed for disallowed deductions | item     1
Gain related to indirect tax contingencies $ 22 $ 4  
Other Current Liabilities And Other Noncurrent Liabilities      
Environmental remediation      
Estimated potential liability for all environmental matters     $ 26