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Restructuring (Narrative) (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) Employee | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Document Period End Date | Mar. 31, 2017 |  |
Restructuring Charges | $ 7 | $ 15 |
Restructuring Reserve | 10 |  | $ 6
T17 Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | $ 7 |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee | 335 |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employee | 240 |  |
Restructuring and Related Cost, Expected Cost | $ 40 |  |
Payments for Restructuring | 2 |  |
International |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 4 |  | $ 5
International | T17 Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | 0 |  |
Payments for Restructuring | $ 0 |  |

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