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Basis of Presentation - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 08, 2020
USD ($)
Dec. 31, 2020
USD ($)
segment
Sep. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]              
Deferred acquisition-related installment payment classified as cash used for investing activities         $ 0 $ 10 $ 37
Deferred acquisition-related installment payment adjusted to financing activities         $ 10 0 0
Number of reportable segments | segment   4     4    
Revolving credit facility borrowed amount       $ 150 $ 300 150 $ 0
Deferred tax payments           $ 78  
Senior Secured Revolving Credit Facility [Member]              
Segment Reporting Information [Line Items]              
Revolving credit facility borrowed amount $ 300            
COVID 19 [Member]              
Segment Reporting Information [Line Items]              
Deferred tax payments   $ 80     80    
Payment of tax   $ 35          
COVID 19 [Member] | Senior Secured Revolving Credit Facility [Member]              
Segment Reporting Information [Line Items]              
Revolving credit facility borrowed amount $ 300            
Southern Ionics Minerals, LLC [Member]              
Segment Reporting Information [Line Items]              
Deferred acquisition-related installment payment classified as cash used for investing activities     $ 10        
Deferred acquisition-related installment payment adjusted to financing activities         $ 10