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Financial Instruments - Hedges of Net Investments in International Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Euro notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | $ 151 | $ (168) | $ 76 | $ (196)
British pound sterling notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | 21 | (10) | 8 | (15)
Swiss franc notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | 42 | (49) | 16 | (64)
Canadian dollar notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | $ 6 | $ 0 | $ 4 | $ 0

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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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