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Financial Instruments - Non-U.S. Dollar Debt Designated as Net Investment Hedges (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Euro notes |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | $ (251) | $ 60 | $ 126
British pound sterling notes |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | (8) | (10) | 19
Swiss franc notes |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | (82) | (19) | 7
Canadian dollar notes |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
After-tax gains/(losses) related to hedges of net investments in international operations | $ (7) | $ (17) | $ 17

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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=121590274&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=121641772&loc=SL7669646-108580 + Details
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