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Quarterly Financial Data (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment and restructuring, after tax |  |  | $ 69 |  | $ 8 | $ 13 |  | $ 8 | $ 8 |
Impairment and restructuring per share, after tax |  |  | $ 0.12 |  | $ 0.01 | $ 0.03 |  | $ 0.01 | $ 0.01 |
Employee benefit curtailment, after tax |  |  |  |  |  | $ 24 |  |  |  |
Employee benefit curtailment, per share |  |  |  |  |  | $ 0.04 |  |  |  |
Impairment, settlement, and restructuring, after tax |  | $ 46 |  | $ 21 |  |  | $ 48 |  |  |
Impairment, settlement, and restructuring per share, after tax |  | $ 0.08 |  | $ 0.04 |  |  | $ 0.08 |  |  |
Tax expense (credit) related to the tax reform and certain out of period discretes |  | $ 370 |  |  |  |  |  |  |  |
Tax expense (credit) related to the tax reform and certain out of period discretes per share |  | $ 0.65 |  |  |  |  |  |  |  |
Gain (loss) on sale/revaluation of assets after tax |  |  | $ 10 | $ (22) |  |  | $ (9) | $ 101 |  |
Gain (loss) on sale of assets, after tax, per share |  |  | $ 0.02 | $ (0.04) |  |  | $ (0.02) | $ 0.17 |  |
Out of period tax discrete expense (income) items |  |  |  |  | $ 4 | $ 21 |  | $ 6 |  |
Out of period tax discrete expense (income) items, per share |  |  |  |  | $ 0.01 | $ 0.03 |  | $ 0.01 |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  | $ 7 |  |  |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax |  |  | $ 0.01 |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 559 |  |  |  |  |  |  |  |  | $ 559

X
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- Definition The after tax impact of gain on sale of assets on diluted earnings per share. + References No definition available. + Details
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- Definition This element represents the after-tax amount of gain (loss) on sale/revaluation of assets. + References No definition available. + Details
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- Definition Impairment and restructuring, after tax + References No definition available. + Details
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- Definition Impairment and restructuring per share, after tax + References No definition available. + Details
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- Definition Impairment, settlement, and restructuring, after tax + References No definition available. + Details
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- Definition Impairment, settlement, and restructuring per share, after tax + References No definition available. + Details
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- Definition Tax expense (credit) related to the tax reform and certain out of period discretes per share + References No definition available. + Details
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- Definition The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 + Details
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- Definition Per share impact of the gain (loss) on the extinguishment of debt, net of applicable taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 + Details
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