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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Taxes [Abstract]        
Total income tax expense (benefit) $ (1,714) $ 613 $ (5,435) $ 1,698
U.S. statutory income tax rate (35.00%) 35.00% (35.00%) 35.00%
Non-deductible goodwill and intangibles impairment 5.00% 0.00% 2.00% 0.00%
Taxation on Canadian operations 0.00% 0.00% 1.00% 1.00%
State income taxes (1.00%) 2.00% (2.00%) 1.00%
Repatriations 0.00% 0.00% 0.00% 7.00%
Other 1.00% 0.00% (1.00%) 1.00%
Effective income tax rate (30.00%) 37.00% (35.00%) 45.00%