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Restructuring (Narrative) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Employee | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Document Period End Date |  |  | Sep. 30, 2017 |  |
Restructuring Charges | $ 7 | $ 6 | $ 52 | $ 26 |
Restructuring Reserve | 3 |  | 3 |  | $ 6
T17 Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  | $ 31 |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee |  |  | 620 |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employee |  |  | 595 |  |
Restructuring and Related Cost, Expected Cost | 4 |  | $ 4 |  |
Payments for Restructuring |  |  | 30 |  |
International |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve | $ 2 |  | 2 |  | $ 5
International | T17 Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  | 7 |  |
Payments for Restructuring |  |  | $ 7 |  |

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