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Restructuring (Summary Of Changes To Restructuring-Related Liabilities) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |
Document Period End Date | Mar. 31, 2017 |
Restructuring Reserve [Roll Forward] |  |
Balance as of January 1, 2016 | $ 6 |
Restructuring expense | (7) | $ (15)
Balance as of March 31, 2017 | 10 |
International |  |
Restructuring Reserve [Roll Forward] |  |
Balance as of January 1, 2016 | 1 |
Balance as of March 31, 2017 | 6 |
International |  |
Restructuring Reserve [Roll Forward] |  |
Balance as of January 1, 2016 | 5 |
Balance as of March 31, 2017 | 4 |
2014 T15 Restructuring [Member] |  |
Restructuring Reserve [Roll Forward] |  |
Payment for Restructuring | (1) |
2014 T15 Restructuring [Member] | International |  |
Restructuring Reserve [Roll Forward] |  |
Payment for Restructuring | 0 |
2014 T15 Restructuring [Member] | International |  |
Restructuring Reserve [Roll Forward] |  |
Payment for Restructuring | (1) |
T17 Restructuring [Member] |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring expense | (7) |
Payment for Restructuring | (2) |
T17 Restructuring [Member] | International |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring expense | (7) |
Payment for Restructuring | (2) |
T17 Restructuring [Member] | International |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring expense | 0 |
Payment for Restructuring | 0 |
Personnel Related |  |
Restructuring Reserve [Roll Forward] |  |
Balance as of January 1, 2016 | 5 |
Balance as of March 31, 2017 | 9 |
Personnel Related | 2014 T15 Restructuring [Member] |  |
Restructuring Reserve [Roll Forward] |  |
Payment for Restructuring | (1) |
Personnel Related | T17 Restructuring [Member] |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring expense | (7) |
Payment for Restructuring | (2) |
Facility Related |  |
Restructuring Reserve [Roll Forward] |  |
Balance as of January 1, 2016 | 1 |
Balance as of March 31, 2017 | 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 |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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