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Financial Instruments - Non-U.S. Dollar Debt Designated as Net Investment Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	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

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