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Hedges of Net Investments in International Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Euro notes |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains / (losses) recognized in OCI | $ (323) | $ 73 | $ 268
Pound sterling notes |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains / (losses) recognized in OCI | (26) | 148 | 42
Swiss franc notes |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains / (losses) recognized in OCI | $ (49) | $ 12 | $ 9

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- Definition Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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