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Asset Impairment, Exit and Implementation Costs (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | $ 99,000,000 | $ 6,000,000 |  |
Charges |  |  | 52,000,000 |  |  |
Payments for restructuring |  |  | 119,000,000 |  |  |
Cost Reduction Program [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related cost, expected cost |  | $ 240,000,000 | 240,000,000 |  | $ 240,000,000 |
Restructuring charges |  |  |  |  |  | $ 121,000,000
Charges |  |  |  |  | 220,000,000 |
Payments for restructuring | $ 0 | 38,000,000 | 110,000,000 |  |  |
Refocus of Innovative Product Efforts [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | 12,000,000 |  |  | 272,000,000
Employee Severance [Member] | Cost Reduction Program [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related cost, expected cost |  | 210,000,000 | 210,000,000 |  | 210,000,000 |
Other Restructuring [Member] | Cost Reduction Program [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related cost, expected cost |  | 30,000,000 | 30,000,000 |  | $ 30,000,000 |
Other Restructuring [Member] | Refocus of Innovative Product Efforts [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 63,000,000
Asset Impairment and Exit Costs [Member] | Cost Reduction Program [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  | $ 5,000,000 | $ 99,000,000 |  |  |
Asset Impairment and Exit Costs [Member] | Refocus of Innovative Product Efforts [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 209,000,000

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