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Fair Value Measurement - Nonrecurring (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair Value - Net PP&E (held for sale)   $ 217            
Fair Value - Net PP&E (held for use) $ 13   $ 23 $ 217 $ 440   $ 42  
Fair Value - Net PP&E (unproved property)           $ 104    
Fair Value - Equity Method Investments 90       10,210      
Before-Tax Loss - Equity method investments 40       1,507      
Before-Tax Loss - Net PP&E (held for sale)   99            
Before-Tax Loss - Net PP&E (unproved propery)           240    
Before-Tax Loss - Net PP&E (held for use) 29   53 129 595 7 70 $ 9
Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair Value - Net PP&E (held for sale)   $ 217            
Fair Value - Equity Method Investments 4              
Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair Value - Net PP&E (held for use) 13   $ 23 $ 217 440   $ 42  
Fair Value - Net PP&E (unproved property)           $ 104    
Fair Value - Equity Method Investments $ 86       $ 10,210