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Estimates (Property, Plant and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross $ 79,776   $ 71,177
Less - Accumulated depreciation (12,813)   (10,089)
Property, Plant and Equipment, Net 66,963 $ 61,088 61,088
Land and Land Improvements [Member]      
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross 2,146   2,222
Building and Building Improvements [Member]      
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross 2,664   2,786
Pipelines [Member]      
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross 57,584   44,673
Natural gas and NGL storage facilities (5 to 46 years)      
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross 1,898   1,681
Bulk storage, equipment and facilities (2 to 83 years)      
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross 3,395   3,036
Vehicles [Member]      
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross 123   126
Right of way (20 to 83 years)      
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross 3,555   3,432
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 1,026   1,029
Construction Work-In-Process [Member]      
Property, Plant and Equipment, Net [Abstract]      
Property, plant and equipment, gross $ 6,067   $ 10,911