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Stockholders' Equity Stockholder's Equity (Schedule of tax benefit (expense) on net activity) (Details) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other Comprehensive Income (Loss), Tax | $ 12 | $ (175) | $ 1,403
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Other Comprehensive Income (Loss), Tax | (19) | 7 | (26)
Pension Plan [Member] |  |  |
Other Comprehensive Income (Loss), Tax | (163) | (317) | 1,274
Other Post Employment Benefit Plans [Member] |  |  |
Other Comprehensive Income (Loss), Tax | $ 194 | $ 135 | $ 155

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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65896914&loc=d3e39076-109324 + Details
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