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Restructuring (Summary Of Changes To Restructuring-Related Liabilities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |
Document Period End Date |  |  | Jun. 30, 2017 |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2016 |  |  | $ 6 |
Restructuring expense | $ (38) | $ (5) | (45) | $ (20)
Balance as of June 30, 2017 | 5 |  | 5 |
International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2016 |  |  | 1 |
Balance as of June 30, 2017 | 1 |  | 1 |
International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2016 |  |  | 5 |
Balance as of June 30, 2017 | 4 |  | 4 |
2014 T15 Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payment for Restructuring |  |  | (2) |
2014 T15 Restructuring [Member] | International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payment for Restructuring |  |  | (1) |
2014 T15 Restructuring [Member] | International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payment for Restructuring |  |  | (1) |
T17 Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expense |  |  | (24) |
Payment for Restructuring |  |  | (23) |
T17 Restructuring [Member] | International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expense |  |  | (21) |
Payment for Restructuring |  |  | (20) |
T17 Restructuring [Member] | International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expense |  |  | (3) |
Payment for Restructuring |  |  | (3) |
Personnel Related |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2016 |  |  | 5 |
Balance as of June 30, 2017 | 4 |  | 4 |
Personnel Related | 2014 T15 Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payment for Restructuring |  |  | (2) |
Personnel Related | T17 Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expense |  |  | (12) |
Payment for Restructuring |  |  | (11) |
Facility Related |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2016 |  |  | 1 |
Balance as of June 30, 2017 | 1 |  | 1 |
Facility Related | 2014 T15 Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payment for Restructuring |  |  | 0 |
Facility Related | T17 Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expense |  |  | 0 |
Payment for Restructuring |  |  | 0 |
Other Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2016 |  |  | 0 |
Balance as of June 30, 2017 | $ 0 |  | 0 |
Other Restructuring [Member] | 2014 T15 Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Payment for Restructuring |  |  | 0 |
Other Restructuring [Member] | T17 Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expense |  |  | (12) |
Payment for Restructuring |  |  | $ (12) |

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