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Derivative Instruments and Hedging Activities - Classification and Fair Value Amounts of Derivative Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value $ 21 $ 21
Derivative liability, fair value 218 54
Derivative instruments designated as hedges    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 13 20
Derivative liability, fair value 218 52
Derivative instruments designated as hedges | Interest rate contracts | Other non-current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 0 10
Derivative instruments designated as hedges | Interest rate contracts | Other non-current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 217 52
Derivative instruments designated as hedges | Foreign exchange contracts | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 13 10
Derivative instruments designated as hedges | Foreign exchange contracts | Accounts payable and accrued liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 1 0
Undesignated derivative instruments | Foreign exchange contracts | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 8 1
Undesignated derivative instruments | Foreign exchange contracts | Accounts payable and accrued liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value $ 0 $ 2