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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2022
Assets and liabilities measured at fair value on a recurring basis              
Payments for Strategic Venture Compliance $ 5 $ 5 $ 5 $ 5 $ 5 $ 5  
Estimate of Fair Value Measurement              
Assets and liabilities measured at fair value on a recurring basis              
Fair value of long-term debt, including current portion 4,113           $ 3,781
Reported Value Measurement              
Assets and liabilities measured at fair value on a recurring basis              
Fair value of long-term debt, including current portion 3,465           3,462
Recurring basis              
Assets and liabilities measured at fair value on a recurring basis              
Cash equivalents 1,507           2,410
Nonqualified employee benefit trusts 20           19
Derivative Liability 47            
Embedded derivative liability (15)           (15)
Derivative Asset 16           3
Recurring basis | Quoted Prices in Active Markets (Level 1)              
Assets and liabilities measured at fair value on a recurring basis              
Cash equivalents 1,507           2,410
Nonqualified employee benefit trusts 20           19
Derivative Liability 0            
Embedded derivative liability 0           0
Derivative Asset 0           0
Recurring basis | Significant Other Observable Inputs (Level 2)              
Assets and liabilities measured at fair value on a recurring basis              
Cash equivalents 0           0
Nonqualified employee benefit trusts 0           0
Derivative Liability 47            
Embedded derivative liability (15)           (15)
Derivative Asset 16           3
Recurring basis | Fair Value, Inputs (Level 3)              
Assets and liabilities measured at fair value on a recurring basis              
Cash equivalents 0           0
Nonqualified employee benefit trusts 0           0
Derivative Liability 0            
Embedded derivative liability 0           0
Derivative Asset $ 0           $ 0