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Investments, Loans and Long-Term Receivables (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) asset joint_venture	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2007 USD ($)	Sep. 30, 2016 USD ($)	Aug. 31, 2016 USD ($)	May 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Retained earnings related to undistributed earnings of affilated companies		$ 1,945,000,000
Dividends received from affiliates		616,000,000	$ 1,769,000,000	$ 3,305,000,000
Equity investments		$ 13,102,000,000	11,977,000,000
Refining Facilities
Schedule of Equity Method Investments [Line Items]
Number of assets contributed | asset		2
WRB Refining LP
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest		50.00%
Dividends received from affiliates	$ 760,000,000
Amortization period for basis difference of assets contributed to WRB, years		26 years
Equity investments		$ 2,088,000,000
Equity investments, basis difference		2,970,000,000
Equity investment, amortization of basis difference		$ 185,000,000	218,000,000	$ 184,000,000
Special dividend amount	1,232,000,000
WRB Refining LP | Proceeds From Asset Dispositions
Schedule of Equity Method Investments [Line Items]
Return of investment	$ 472,000,000
WRB Refining LP | Cenovus Energy Inc [Member]
Schedule of Equity Method Investments [Line Items]
Contribution obligation by co-venturer					$ 7,500,000,000
Contribution obligation by co-venturer, obligation period					10 years
DCP Midstream
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest		50.00%
Equity investments		$ 2,258,000,000
Equity investments, basis difference		$ 55,000,000
Cash contribution			$ 1,500,000,000
CP Chem
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest		50.00%
Equity investments		$ 5,773,000,000
CP Chem | Minimum
Schedule of Equity Method Investments [Line Items]
Supply and purchase agreements, initial term		1 year
CP Chem | Maximum
Schedule of Equity Method Investments [Line Items]
Supply and purchase agreements, initial term		99 years
Rockies Express Pipeline LLC (REX)
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest		25.00%	25.00%
Equity investments		$ 455,000,000
Cash contribution			$ 112,000,000
Amount of debt repaid by REX			450,000,000
Approximate amount of remaining long-term debt of REX			$ 2,600,000,000
DCP Sand Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest		33.30%
Equity investments		$ 445,000,000
DCP Southern Hills Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest		33.30%
Equity investments		$ 212,000,000
Equity investments, basis difference		$ 96,000,000
DAPL And ETCOP
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest		25.00%
Number of joint ventures | joint_venture		2
Equity method investment, line of credit, maximum borrowing capacity							$ 2,500,000,000.0
Dakota Access LLC
Schedule of Equity Method Investments [Line Items]
Equity investments		$ 403,000,000
Contribution obligation by co-venturer		976,000,000
Equity method investment, maximum borrowing capacity						$ 1,411,000,000		$ 2,256,000,000
Equity method investment, borrowing outstanding		$ 244,000,000
Energy Transfer Crude Oil Company LLC (ETCOP)
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest		25.00%
Equity investments		$ 129,000,000
Contribution obligation by co-venturer		22,000,000
Equity method investment, maximum borrowing capacity						$ 76,000,000		$ 227,000,000
Equity method investment, borrowing outstanding		$ 6,000,000

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