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Impairments - Fair Value Measurements, Nonrecurring (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairments     $ 97 $ 24    
Goodwill $ 0 $ 95 0 95 $ 95 $ 97
Goodwill impairment loss     95 0    
Equity method investments 476   476   $ 663  
Oil and Gas Properties            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long lived assets held for use, fair value 0 19 0 56    
Impairments 0 18 2 24    
Goodwill            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Goodwill 0   0      
Goodwill impairment loss     95 0    
Equity Method Investments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investments 142   $ 142      
Equity method investment, impairment $ 152 $ 0   $ 0