Investments, Loans and Long-Term Receivables (Narrative) (Details) (USD $)	12 Months Ended									12 Months Ended			9 Months Ended		3 Months Ended				12 Months Ended	3 Months Ended	12 Months Ended		12 Months Ended			3 Months Ended		12 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 WRB Refining LP [Member]	Dec. 31, 2012 WRB Refining LP [Member]	Dec. 31, 2011 WRB Refining LP [Member]	Sep. 30, 2013 WRB Refining LP [Member]	Dec. 31, 2013 DCP Midstream [Member]	Dec. 31, 2013 CP Chem [Member]	Dec. 31, 2013 CP Chem [Member] Minimum [Member]	Dec. 31, 2013 CP Chem [Member] Maximum [Member]	Dec. 31, 2013 Malaysian Refining Company [Member]	Dec. 31, 2012 Rockies Express Pipeline LLC (REX) [Member]	Dec. 31, 2013 Rockies Express Pipeline LLC (REX) [Member]	Dec. 31, 2012 DCP Sand Hills Pipeline, LLC [Member]	Dec. 31, 2013 DCP Sand Hills Pipeline, LLC [Member]	Dec. 31, 2013 DCP Southern Hills Pipeline, LLC [Member]	Dec. 31, 2012 DCP Southern Hills Pipeline, LLC [Member]	Dec. 31, 2011 Seaway Products Pipeline Company [Member]	Dec. 31, 2012 Southern Hills [Member]	Dec. 31, 2013 Southern Hills [Member]	Aug. 28, 2009 Merey Sweeny [Member]	Dec. 31, 2013 Refining [Member]	Dec. 31, 2012 Refining [Member]	Dec. 31, 2011 Refining [Member]	Dec. 31, 2012 Refining [Member] Malaysian Refining Company [Member]	Dec. 31, 2013 Refining [Member] Malaysian Refining Company [Member]	Dec. 31, 2013 Cenovus Energy Inc [Member] WRB Refining LP [Member]	Aug. 27, 2009 Petroleos De Venezuela Sa [Member] Merey Sweeny [Member]	Aug. 27, 2009 Conocophillips [Member] Merey Sweeny [Member]	Dec. 31, 2013 Malaysian Refining Company (MRC) [Member] Market-based Shareholder Financing Agreement [Member]	Sep. 30, 2013 Conocophillips [Member] WRB Refining LP [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest				50.00%			50.00%	50.00%	50.00%			47.00%		25.00%	33.30%	33.30%	33.30%	33.30%									47.00%			50.00%
Retained earnings related to undistributed earnings of affilated companies	$ 878,000,000
Dividends received from affiliates	2,752,000,000	2,304,000,000	2,209,000,000
Equity investments, amortization period for basis difference				26 years
Additional ownership interest purchased																																0.40%
Equity investments	11,080,000,000	10,291,000,000		3,475,000,000				1,335,000,000	4,241,000,000			419,000,000		250,000,000		392,000,000					157,000,000			1,062,000,000
Equity investments, basis difference				3,555,000,000																	161,000,000
Equity investment, amortization of basis difference				185,000,000	180,000,000	185,000,000
Contribution obligation by co-venturer																												7,500,000,000
Contribution obligation by co-venturer, obligation period																												10 years
Contribution obligation remaining																												2,900,000,000
Supply and purchase agreements, initial term										1 year	99 years
Equity method investment, before tax impairment		1,044,000,000											480,000,000											564,000,000		564,000,000
Investment made to acquire ownership interest															234,000,000					225,000,000
Deferred gain on sale of equity method investment																			156,000,000
Income (Loss) from Equity Method Investments	3,073,000,000	3,134,000,000	2,843,000,000																		2,000,000		1,213,000,000	1,542,000,000	1,270,000,000
Additional equity method ownership interest acquired in Merey Sweeny Limited Partnership																						50.00%
Co-venturers interest in equity investment, percentage																													50.00%
Repayment of Notes Receivable from Related Parties																															$ 65,000,000