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Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property and Equipment
Capitalized interest	$ 30	$ 35	$ 47
Property and equipment, gross	17,866	16,862
Accumulated depreciation	(3,079)	(2,773)
Property and equipment, net	14,787	14,089
Depreciation expense	454	463	470
Pipelines and related facilities
Property and Equipment
Property and equipment, gross	$ 10,137	9,585
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	$ 5,854	5,558
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	$ 410	414
Trucking equipment and other | Minimum
Property and Equipment
Estimated useful lives	2 years
Trucking equipment and other | Maximum
Property and Equipment
Estimated useful lives	15 years
Construction in progress
Property and Equipment
Property and equipment, gross	$ 795	610
Office property and equipment
Property and Equipment
Property and equipment, gross	$ 248	255
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	$ 422	440
Property and equipment
Property and Equipment
Capitalized interest	21	17	34
(Gains)/losses on asset sales and asset impairments, net | Facilities
Property and Equipment
Non-cash charge related to write-down of long-lived assets	$ 6
Rail And Other Terminal Assets | (Gains)/losses on asset sales and asset impairments, net | Facilities
Property and Equipment
Non-cash charge related to write-down of long-lived assets		$ 152	$ 80

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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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