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Restructuring and Asset Impairment Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Net current period restructuring charges, continuing operations | $ 78 | $ 92 | $ 73
Restructuring reserve [Roll Forward] |  |  |
Balance at beginning of period | 44 | 21 |
Restructuring provision | 78 | 103 |
Reversals of prior accruals | 0 | (11) |
Total Net Current Period Charges | 78 | 92 |
restructuring cash payments charged against the reserve | (75) | (65) |
Balance at end of period | 49 | 44 | 21
Strategic transformation costs | 3 | 9 | 28
Other Restructuring Costs | 2 | (4) |
Commercial Industries [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net current period restructuring charges, continuing operations | 26 | 15 | 27
Government services [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net current period restructuring charges, continuing operations | 1 | 2 | 3
Transportation Services [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net current period restructuring charges, continuing operations | 3 | 1 | 2
All Other Segments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net current period restructuring charges, continuing operations | 6 | 4 | 17
Corporate, Non-Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net current period restructuring charges, continuing operations | 42 | 70 | 24
Employee Severance [Member] |  |  |
Restructuring reserve [Roll Forward] |  |  |
Balance at beginning of period | 14 | 15 |
Restructuring provision | 39 | 49 |
Reversals of prior accruals | (5) | (8) |
Total Net Current Period Charges | 34 | 41 |
restructuring cash payments charged against the reserve | (35) | (42) |
Balance at end of period | 13 | 14 | 15
Other Restructuring Costs | 0 | 0 |
Lease Cancellation and Other Costs [Member] |  |  |
Restructuring reserve [Roll Forward] |  |  |
Balance at beginning of period | 30 | 6 |
Restructuring provision | 39 | 54 |
Reversals of prior accruals | 5 | (3) |
Total Net Current Period Charges | 44 | 51 |
restructuring cash payments charged against the reserve | (40) | (23) |
Balance at end of period | 36 | 30 | $ 6
Other Restructuring Costs | $ 2 | $ (4) |

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