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Restructuring (Narrative) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Employee | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges | $ 4 | $ 7 | $ 14 | $ 52 |
Restructuring Reserve | 3 |  | 3 |  | $ 4
Workforce Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  | $ 9 |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee |  |  | 119 |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employee |  |  | 115 |  |
Restructuring and Related Cost, Expected Cost | 5 |  | $ 5 |  |
Payments for Restructuring |  |  | 8 |  |
T17 Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  | $ 2 |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employee |  |  | 673 |  |
Payments for Restructuring |  |  | $ 4 |  |
2018 Truck Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  | 2 |  |
Payments for Restructuring |  |  | 2 |  |
International [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve | $ 2 |  | 2 |  | $ 3
International [Member] | Workforce Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  | 7 |  |
Payments for Restructuring |  |  | 6 |  |
International [Member] | T17 Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  | 0 |  |
Payments for Restructuring |  |  | 2 |  |
International [Member] | 2018 Truck Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  | 0 |  |
Payments for Restructuring |  |  | $ 0 |  |

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