Income Taxes (Schedule Of Effective Income Tax Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Taxes [Abstract]
Total income tax expense (benefit)	$ (2,035)us-gaap_IncomeTaxExpenseBenefit	$ 231us-gaap_IncomeTaxExpenseBenefit
U.S. statutory income tax rate	(35.00%)	35.00%
Taxation on Canadian operations	0.00%	(3.00%)
State income taxes	(1.00%)	1.00%
Taxes on General Partner formation	0.00%	9.00%
Other	0.00%	(1.00%)
Effective income tax rate	(36.00%)	41.00%

Effective income tax rate reconciliation, formation of entity.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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