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Quarterly Financial Data (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Impairment and restructuring, after tax |  |  | $ 16 | $ 12 |  | $ 69 |  | $ 8 |
Impairment and restructuring per share, after tax |  |  | $ 0.03 | $ 0.02 |  | $ 0.12 |  | $ 0.01 |
Impairment, settlement, and restructuring, after tax | $ 196 |  |  |  | $ 46 |  | $ 21 |  |
Impairment, settlement, and restructuring per share, after tax | $ 0.35 |  |  |  | $ 0.08 |  | $ 0.04 |  |
Acquisition-related expenses | $ 9 |  |  |  |  |  |  |  |
Acquisition-related expenses, per share | $ 0.01 |  |  |  |  |  |  |  |
Tax expense (credit) related to the tax reform and certain out of period discretes | $ 29 | $ 3 | $ 7 | $ (14) | $ 370 |  |  |  |
Tax expense (credit) related to the tax reform and certain out of period discretes per share | $ 0.05 | $ 0.01 | $ 0.01 | $ (0.03) | $ 0.65 |  |  |  |
Gain (loss) on sale/revaluation of assets after tax | $ 7 | $ (20) |  |  |  | $ (10) | $ 22 |  |
Gain (loss) on sale of assets, after tax, per share | $ 0.02 | $ (0.04) |  |  |  | $ (0.02) | $ 0.04 |  |
Out of period tax discrete expense (income) items |  |  |  |  |  |  |  | $ 4 |
Out of period tax discrete expense (income) items, per share |  |  |  |  |  |  |  | $ 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

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- Definition The amount of expenses related to pending or completed acquisitions, per share. + References No definition available. + Details
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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 The amount of out of period tax discrete expense (income) items charged (credited) to earnings. + References No definition available. + Details
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