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Financing Arrangements and Derivative Financial Instruments - Fair Values for Foreign Currency Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Not Designated as Hedging Instrument          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative, notional amount $ 1,335   $ 1,335   $ 1,664
Foreign currency derivatives, net transaction gains (14) $ (41) 41 $ (3)  
Designated as Hedging Instrument          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative, notional amount 48   48   50
Accounts receivable          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value - asset, not designated as hedging instrument 21   21   1
Other Current Liabilities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value - liability, not designated as hedging instrument (4)   (4)   (27)
Fair value - liability, designated as hedging instrument $ (2)   $ (2)   $ (7)