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Estimates (Property, Plant and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross $ 71,177 $ 61,562 [1]
Less - Accumulated depreciation (10,089) (7,984) [1]
Property, Plant and Equipment, Net 61,088 53,578 [1]
Land and Land Improvements [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 2,222 1,189
Building and Building Improvements [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 2,786 2,247
Pipelines [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 44,673 36,570
Natural gas and NGL storage facilities (5 to 46 years)    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 1,681 1,451
Bulk storage, equipment and facilities (2 to 83 years)    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 3,883 3,701
Vehicles [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 126 217
Right of way (20 to 83 years)    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 3,432 3,349
Natural resources    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 434 434
Property, Plant and Equipment, Other Types [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross 1,029 2,285
Construction Work-In-Process [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant and equipment, gross $ 10,911 $ 10,119
[1] * As adjusted. See Note 2.