Income Taxes (Tables)

3 Months Ended

Mar. 31, 2016

Income Taxes [Abstract]

Schedule Of Effective Income Tax Rate Reconciliation

	Three Months Ended March 31,
	2016		2015
Total income tax benefit (millions)	$	(217)	$	(2,035)
U.S. statutory income tax rate		(35%)		(35%)
Deferred tax asset valuation allowance		22%		0%
Non-deductible goodwill impairment		8%		0%
Taxation on Canadian operations		2%		0%
State income taxes		(1%)		(1%)
Other		(2%)		0%
Effective income tax rate		(6%)		(36%)