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Restructuring (Narrative) (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Employee | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | $ 6 | $ 7 |
Restructuring Reserve | 3 |  | $ 4
Workforce Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | $ 4 |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee | 47 |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employee | 43 |  |
Restructuring and Related Cost, Expected Cost | $ 15 |  |
Payments for Restructuring | $ 3 |  |
T17 Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employee | 673 |  |
Payments for Restructuring | $ 2 |  |
2018 Truck Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | 1 |  |
Restructuring and Related Cost, Expected Cost | 2 |  |
Payments for Restructuring | 1 |  |
International [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 3 |  | $ 3
International [Member] | Workforce Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | 3 |  |
Payments for Restructuring | 2 |  |
International [Member] | T17 Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Payments for Restructuring | 1 |  |
International [Member] | 2018 Truck Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | 0 |  |
Payments for Restructuring | $ 0 |  |

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