Income Taxes (Tables)

3 Months Ended

Mar. 31, 2015

Income Taxes [Abstract]

Schedule Of Effective Income Tax Reconciliation

	Three Months Ended March 31,
	2015		2014
Total income tax expense (benefit) (millions)	$	(2,035)	$	231
U.S. statutory income tax rate		(35)%		35%
Taxation on Canadian operations		0%		(3)%
State income taxes		(1)%		1%
Taxes on General Partner formation		0%		9%
Other		0%		(1)%
Effective income tax rate		(36)%		41%