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Other Commitments and Contingencies (Details) - USD ($)
$ in Millions
1 Months Ended 14 Months Ended
Mar. 31, 2019
May 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]        
Self insurance reserve, noncurrent     $ 42 $ 48
Accounts Payable and Accrued Liabilities        
Loss Contingencies [Line Items]        
Self insurance reserve, noncurrent     14 16
Other Current Liabilities        
Loss Contingencies [Line Items]        
Self insurance reserve, noncurrent     2 3
Other Liabilities        
Loss Contingencies [Line Items]        
Self insurance reserve, noncurrent     26 $ 29
Chadian Employee Class Action        
Loss Contingencies [Line Items]        
Damages awarded, value $ 34 $ 25    
Claims in unpaid bonuses   $ 122    
Chadian Employee Class Action | Provisional Award        
Loss Contingencies [Line Items]        
Damages awarded, value $ 2      
North West Rail Link Project        
Loss Contingencies [Line Items]        
Claims in unpaid bonuses     $ 300  
Noncontrolling interest, ownership percentage by parent     33.00%