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Other Liabilities - Schedule of Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Liabilities Noncurrent [Abstract]    
Employee-related costs $ 108 $ 113
Accrued litigation 51 50
Environmental remediation 295 332
Asset retirement obligations 63 69
Deferred revenue 5 8
Miscellaneous 68 61
Total other liabilities $ 590 $ 633