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Asset Impairment, Exit and Implementation Costs (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Charges |  | $ 40,000,000 |
Restructuring charges |  | 49,000,000 | $ 3,000,000
Payments for restructuring |  | 35,000,000 |
Cost Reduction Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related cost, expected cost | $ 210,000,000 |  |
Charges |  | 182,000,000 |
Restructuring charges | 121,000,000 |  |
Payments for restructuring | $ 0 | 22,000,000 |
Employee Severance [Member] | Cost Reduction Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related cost, expected cost |  | 180,000,000 |
Other Restructuring [Member] | Cost Reduction Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related cost, expected cost |  | $ 30,000,000 |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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