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Acquisitions And Divestitures (Schedule Of Revenue And Earnings For General Partner and GeoSouthern) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Total operating revenues	$ 5,995us-gaap_Revenues	$ 5,336us-gaap_Revenues	$ 4,510us-gaap_Revenues	$ 3,725us-gaap_Revenues	$ 2,624us-gaap_Revenues	$ 2,714us-gaap_Revenues	$ 3,088us-gaap_Revenues	$ 1,971us-gaap_Revenues	$ 19,566us-gaap_Revenues	$ 10,397us-gaap_Revenues	$ 9,501us-gaap_Revenues
Total operating expenses									14,868us-gaap_CostsAndExpenses	9,830us-gaap_CostsAndExpenses	9,427us-gaap_CostsAndExpenses
Operating income									4,698us-gaap_OperatingIncomeLoss	567us-gaap_OperatingIncomeLoss	74us-gaap_OperatingIncomeLoss
GeoSouthern Intermediate Holdings, LLC [Member]
Business Acquisition [Line Items]
Total operating revenues									1,873
Total operating expenses									960
Operating income									913
General Partner [Member]
Business Acquisition [Line Items]
Total operating revenues									2,509
Total operating expenses									2,464
Operating income									$ 45