Property and Equipment (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property and Equipment
Capitalized interest		$ 18	$ 24	$ 34
Property and equipment, gross		19,257	18,585
Accumulated depreciation		(4,354)	(3,974)
Property and equipment, net		14,903	14,611
Depreciation expense		652	563	525
Construction in progress expenditures incurred but not yet paid		48	$ 51	$ 120
Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow
Property and Equipment
Discount rate, asset impairment analysis, cost of capital, theoretical market participant			14.00%
(Gains)/losses on asset sales and asset impairments, net
Property and Equipment
Non-cash impairment losses, long-lived assets			$ 541
Crude Oil | Pipelines and related facilities
Property and Equipment
Non-cash impairment losses, long-lived assets			$ 415
Crude Oil | (Gains)/losses on asset sales and asset impairments, net | Crude Oil Storage Terminal Assets
Property and Equipment
Non-cash impairment losses, long-lived assets		220
Service Life
Property and Equipment
Depreciation expense		$ 72
Common Units
Property and Equipment
Impact to basic net income per common unit (in dollars per unit)		$ 0.55	$ (3.83)	$ 2.70
Impact to diluted net income per common unit (in dollars per unit)		0.55	$ (3.83)	$ 2.65
Common Units | Service Life
Property and Equipment
Impact to basic net income per common unit (in dollars per unit)		(0.10)
Impact to diluted net income per common unit (in dollars per unit)		$ (0.10)
Pipelines and related facilities
Property and Equipment
Property and equipment, gross		$ 12,765	$ 11,112
Pipelines and related facilities | Minimum
Property and Equipment
Estimated Useful Lives (in years)		10 years
Pipelines and related facilities | Maximum
Property and Equipment
Estimated Useful Lives (in years)		50 years
Storage, terminal and rail facilities
Property and Equipment
Property and equipment, gross		$ 5,100	6,042
Storage, terminal and rail facilities | Minimum
Property and Equipment
Estimated Useful Lives (in years)		10 years
Storage, terminal and rail facilities | Maximum
Property and Equipment
Estimated Useful Lives (in years)		50 years
Trucking equipment and other
Property and Equipment
Property and equipment, gross		$ 502	524
Trucking equipment and other | Minimum
Property and Equipment
Estimated Useful Lives (in years)		2 years
Trucking equipment and other | Maximum
Property and Equipment
Estimated Useful Lives (in years)		15 years
Construction in progress
Property and Equipment
Property and equipment, gross		$ 248	272
Office property and equipment
Property and Equipment
Property and equipment, gross		$ 312	293
Office property and equipment | Minimum
Property and Equipment
Estimated Useful Lives (in years)		2 years
Office property and equipment | Maximum
Property and Equipment
Estimated Useful Lives (in years)		50 years
Land and other
Property and Equipment
Property and equipment, gross		$ 330	$ 342
Pipeline and related facilities and Storage, terminal and rail facilities | Minimum
Property and Equipment
Estimated Useful Lives (in years)			10 years
Pipeline and related facilities and Storage, terminal and rail facilities | Minimum | Service Life
Property and Equipment
Estimated Useful Lives (in years)	10 years
Pipeline and related facilities and Storage, terminal and rail facilities | Maximum
Property and Equipment
Estimated Useful Lives (in years)			70 years
Pipeline and related facilities and Storage, terminal and rail facilities | Maximum | Service Life
Property and Equipment
Estimated Useful Lives (in years)	50 years
Property and equipment
Property and Equipment
Capitalized interest		$ 6	$ 8	$ 14