Property, Plant and Equipment, Components of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Construction in process	$ 340	$ 281
Property, plant and equipment	9,888	10,451
Pipeline Equipment
Property, Plant and Equipment [Abstract]
Property, plant and equipment	8,308	8,368
Accumulated depreciation	3,742	3,402
Hotel Properties
Property, Plant and Equipment [Abstract]
Property, plant and equipment	959	1,083
Accumulated depreciation	472	439
Other Energy Equipment
Property, Plant and Equipment [Abstract]
Property, plant and equipment	281	719
Accumulated depreciation	$ 522	$ 688