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Company Restructuring - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | $ 109 | $ 30 | $ 39
Employee costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative amount incurred to date for active programs | 103 |  |
Exit costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative amount incurred to date for active programs | $ 104 |  |

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