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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Tax [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit) | $ (1,714) |  | $ 613 |  | $ (5,435) | $ 1,698
Tax settlements from prior year examinations |  | $ (57) |  |  |  |
Foreign earnings repatriated |  |  |  | $ 2,800 |  |
Assumed Repatriations Of Foreign Earnings [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Deferred tax liabilities, taxes on unremitted foreign earnings |  |  |  | 143 |  |
Repatriated Foreign Earnings [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  | $ 247 |  |
Canada And Texas Tax Rate Changes [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Change in deferred tax expense |  | $ 44 |  |  |  |
EnLink [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Goodwill and intangibles impairments | $ 799 |  |  |  |  |
U.S. Asset Divestiture [Member] |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Current income tax expense (benefit) |  |  | $ 543 |  |  |

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