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Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property and Equipment
Capitalized interest	$ 35	$ 47	$ 57
Property and equipment, gross	16,862	16,220
Accumulated depreciation	(2,773)	(2,348)
Property and equipment, net	14,089	13,872
Depreciation expense	463	470	380
Pipelines and related facilities
Property and Equipment
Property and equipment, gross	$ 9,585	9,025
Pipelines and related facilities | Minimum
Property and Equipment
Estimated useful lives	10 years
Pipelines and related facilities | Maximum
Property and Equipment
Estimated useful lives	70 years
Storage, terminal and rail facilities
Property and Equipment
Property and equipment, gross	$ 5,558	5,305
Storage, terminal and rail facilities | Minimum
Property and Equipment
Estimated useful lives	30 years
Storage, terminal and rail facilities | Maximum
Property and Equipment
Estimated useful lives	70 years
Trucking equipment and other
Property and Equipment
Property and equipment, gross	$ 414	408
Trucking equipment and other | Minimum
Property and Equipment
Estimated useful lives	3 years
Trucking equipment and other | Maximum
Property and Equipment
Estimated useful lives	15 years
Construction in progress
Property and Equipment
Property and equipment, gross	$ 610	826
Office property and equipment
Property and Equipment
Property and equipment, gross	$ 255	222
Office property and equipment | Minimum
Property and Equipment
Estimated useful lives	2 years
Office property and equipment | Maximum
Property and Equipment
Estimated useful lives	50 years
Land and other
Property and Equipment
Property and equipment, gross	$ 440	434
Property, Plant and Equipment
Property and Equipment
Capitalized interest	17	34	49
Rail And Other Terminal Assets | Depreciation and amortization | Facilities
Property and Equipment
Non-cash charge related to write-down of long-lived assets	$ 152	$ 80	$ 0

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The aggregate amount of write-downs for impairments and accelerated depreciation recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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