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Property, Plant and Equipment Classes and Depreciation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 15,359 $ 14,175  
Property, Plant and Equipment, Net, Excluding Nondepreciable Assets 34,207 35,704  
Property, plant and equipment, net 37,897 40,155  
Depreciation, Depletion and Amortization, Property, Plant and Equipment 2,057 2,022 $ 1,970
Pipelines      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 19,727 20,157  
Equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 24,392 24,152  
Other      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 5,447 5,570  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 1,378 1,456  
Construction work in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 2,312 2,995  
Natural Gas Pipelines Regulated      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net $ 12,349 $ 14,055