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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Euro notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | $ (36) | $ 151 | $ 22 | $ 76
British pound sterling notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | 7 | 21 | 1 | 8
Swiss franc notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | (21) | 42 | (8) | 16
Canadian dollar notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | $ (7) | $ 6 | $ (14) | $ 4

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- Definition Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CCC -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998896-113959 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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