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Change in Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits beginning balance | $ 756 | $ 852 | $ 1,189
Increases from positions taken during prior periods | 18 | 34 | 143
Decreases from positions taken during prior periods | (123) | (74) | (247)
Increases from positions taken during the current period | 90 | 84 | 147
Decreases relating to settlements with taxing authorities | (75) | (13) | (203)
Reductions resulting from the lapse of the applicable statute of limitations | (43) | (41) | (64)
Currency / other | (13) | (86) | (113)
Unrecognized tax benefits ending balance | $ 610 | $ 756 | $ 852

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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