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Stockholders' Equity Stockholder's Equity (Schedule of tax benefit (expense) on net activity) (Details) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Other Comprehensive Income (Loss), Tax | $ (61) | $ 402
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |
Other Comprehensive Income (Loss), Tax | 1 | (10)
Pension Plan [Member] |  |
Other Comprehensive Income (Loss), Tax | (60) | 351
Other Post Employment Benefit Plans [Member] |  |
Other Comprehensive Income (Loss), Tax | $ (2) | $ 61

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