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Financial Instruments - Schedule of Derivative Instruments Not Designated as Hedging Instruments Table (Details) - Derivatives Not Designated as Hedging Instruments: - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative [Line Items]        
Derivatives Not Designated as Hedging Instruments $ (11) $ (71) $ 25 $ (261)
Debt-related        
Derivative [Line Items]        
Derivatives Not Designated as Hedging Instruments (13) (74) 16 (213)
Other balance sheet items        
Derivative [Line Items]        
Derivatives Not Designated as Hedging Instruments $ 2 $ 3 $ 9 $ (48)