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Other Liabilities - Liability Balances (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Other Liabilities [Abstract]        
Uncertain tax provisions $ 84 $ 79    
Lease liabilities 71 68    
Accrued expenses 69 110    
Employee withheld taxes, social security and vacation payments 43 47    
Contract liabilities 31 31 $ 33 $ 29
Accrued interest expense 30 38    
Taxes payable 36 29    
Unfavorable drilling contracts 7 7    
Other liabilities 9 27    
Total Other Liabilities $ 380 $ 436    
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Total Other Liabilities Total Other Liabilities