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Impairments Impairments - Fixed Assets and Other Table (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Property, Plant and Equipment [Line Items]    
Impairments of fixed assets and other $ 391 $ 38
Natural Gas Compressor [Member]    
Property, Plant and Equipment [Line Items]    
Impairments of fixed assets and other 0 20
Buildings and land [Member]    
Property, Plant and Equipment [Line Items]    
Impairments of fixed assets and other 0 7
Other [Member]    
Property, Plant and Equipment [Line Items]    
Impairments of fixed assets and other $ 391 $ 11