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Asset Impairments (Schedule of Asset Impairments) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Goodwill, Impairment Loss |  |  | $ 576 |
Asset impairment charges | $ 5,851 |  | 15,479 |
Asset impairment charges, after tax | 4,042 |  | 10,155 |
U.S. Oil And Gas Assets [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Asset impairment charges | 4,715 |  | 14,340 |
Asset impairment charges, after tax | 2,994 |  | 9,105 |
Canada Oil And Gas Assets [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Asset impairment charges | 336 |  | 336 |
Asset impairment charges, after tax | 248 |  | 248 |
Other Assets [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Asset impairment charges | 1 |  | 4 |
Asset impairment charges, after tax | 1 |  | 3 |
EnLink [Member] |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Goodwill, Impairment Loss | 576 |  | 576 |
Goodwill, Impairment Loss, after tax | 576 |  | 576 |
Impairment of intangible assets | 223 |  | 223 |
Impairment of intangible assets, after tax | $ 223 |  | $ 223 |

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