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Fair Value Measurements - Investments (Details)
$ in Millions
12 Months Ended
Sep. 30, 2022
USD ($)
Units
Sep. 30, 2021
USD ($)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Long-term Investments $ 3,671 $ 4,053
Balance in the NDT 2,500  
Balance in the ART $ 1,100  
Period of time where the investor contributes capital to an investment in a private partnership - minimum | Units 3  
Period of time where the investor contributes capital to an investment in a private partnership - maximum | Units 4  
Minimum investment period 10 years  
Fair value of gross plan assets $ 8,566 9,749
Number of readily available quoted exchange prices for the investments 0  
LTDCP    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Unrealized gains (losses) on investments $ (5) 1
SERP    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Unrealized gains (losses) on investments (19) 7
ART    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Unrealized gains (losses) on investments (190) 145
NDT    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Unrealized gains (losses) on investments (396) $ 279
Equity Funds [Member]    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Commitments, Fair Value Disclosure 187  
Real Estate Funds [Member]    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Commitments, Fair Value Disclosure 128  
Credit [Member]    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Commitments, Fair Value Disclosure 57  
Defensive growth assets    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Commitments, Fair Value Disclosure 104  
Private real estate funds    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Fair value of gross plan assets 75  
Private Credit [Member]    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]    
Commitments, Fair Value Disclosure $ 32