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Financial Instruments, Derivatives and Hedging Activities - Foreign currency hedging (Details) - Foreign Currency Forward Contracts - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Short | Not Designated as Hedging Instrument
Financial instruments, derivatives and hedging activities
Derivative notional amount	$ 409	$ 410
Long | Not Designated as Hedging Instrument
Financial instruments, derivatives and hedging activities
Derivative notional amount	251	224
Cash Flow Hedging | Short | Designated as Hedging Instrument
Financial instruments, derivatives and hedging activities
Derivative notional amount	305	401
Cash Flow Hedging | Long | Designated as Hedging Instrument
Financial instruments, derivatives and hedging activities
Derivative notional amount	$ 482	$ 542

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+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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