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Fair Value Measurements, Derivative Instruments and Hedging Activities and Financial Risks - Estimated Fair Value and Basis of Valuation of Financial Instrument Assets And Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Aug. 31, 2019
Nov. 30, 2018
Assets    
Derivative financial instruments $ 38  
Liabilities    
Derivative financial instruments 26 $ 29
Financial Instruments Measured at Fair Value on a Recurring Basis | Level 1    
Assets    
Restricted cash 16 14
Total 1,170 996
Financial Instruments Measured at Fair Value on a Recurring Basis | Level 1 | Money market funds    
Assets    
Cash and cash equivalents 1,153 982
Financial Instruments Measured at Fair Value on a Recurring Basis | Level 2    
Assets    
Total 37  
Liabilities    
Total 25 29
Financial Instruments Measured at Fair Value on a Recurring Basis | Level 2 | Derivative financial instruments, assets    
Assets    
Derivative financial instruments 37  
Financial Instruments Measured at Fair Value on a Recurring Basis | Level 2 | Derivative financial instruments, liabilities    
Liabilities    
Derivative financial instruments $ 25 $ 29