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Divestitures and Acquisition Acquisition of BP Products North America Inc. (BP) Terminal Assets (Details) $ in Millions		12 Months Ended
	Feb. 01, 2016 USD ($) Terminals	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Terminals
Business Acquisition [Line Items]
Proceeds from noncontrolling interests		$ 19	$ 12	$ 117
BP Terminal Assets [Member]
Business Acquisition [Line Items]
Number of terminals wholly owned | Terminals	1
Number of terminals | Terminals	15
Payments to acquire businesses, gross	$ 349
Property, plant and equipment acquired	396
Current assets acquired	2
Liabilities assumed	$ 49
New Joint Venture with BP [Member] | BP Terminal Assets [Member]
Business Acquisition [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	75.00%
Number of terminals contributed to equity investment | Terminals	14
BP [Member] | New Joint Venture with BP [Member] | BP Terminal Assets [Member]
Business Acquisition [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	25.00%
Proceeds from noncontrolling interests				$ 84
Terminals
Business Acquisition [Line Items]
Number of terminals | Terminals				20

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