Income Taxes (Schedule Of Income Tax (Provisions) Benefits Attributable To Income From Continuing Operations) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Current income taxes	$ 22	$ (48)	$ 22	$ (49)
Deferred income taxes	56	(307)	340	(146)
Income tax benefit (provision)	$ 78	$ (355)	$ 362	$ (195)
Effective Tax Rate	140.00%	35.00%	41.00%	35.00%
Statutory Tax Rate	35.00%		35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 59		$ 59
Unrecognized Tax Benefits	$ 94		$ 94

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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

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Amount 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 attributable to research tax credit.

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Amount of unrecognized tax benefits.

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