Acquisitions Acquisitions (Acquisition Mt. Airy Terminal) (Details) bbl / d in Thousands, bbl in Millions, $ in Millions			3 Months Ended	12 Months Ended
		Sep. 26, 2018 USD ($) bbl / d bbl	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Intangibles, net				$ 1,270	$ 1,359
Goodwill				9,536	10,016	$ 2,245
Income from equity method investments	[1],[2]			$ 290	$ 247	$ 78
Mt. Airy Terminal [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		$ 3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other		1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		336	$ 336
Intangibles, net		9
Goodwill		121	121
Payments to Acquire Businesses, Gross		$ 451	$ 446
Storage Capacity | bbl		4
Barrels Handled | bbl / d		120
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable		$ (17)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		(7)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest		$ 446

[1] “Income from equity method investments” includes the impact of any basis differential amortization or accretion.

[2] The financial information for equity method investments for 2019 includes financial information of equity method investments acquired as part of the Merger. The financial information for equity method investments for 2018 includes financial information of equity method investments acquired as part of the Merger for the last three months of 2018. The financial information for equity method investments for 2017 does not include financial information of equity method investments acquired as part of the Merger. See Note 1 for additional information