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Other Long-Term Liabilities Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Other Long-Term Liabilities    
Interest rate swaps $ 2,041 $ 1,764
Derivative Liability 277  
Accounts Payable and Accrued Liabilities   1
Capital lease obligations 25 223
Currency swap liabilities 209 208 [1]
EnergyRight financing obligation 108 126
Non-current regulatory liabilities 23 0
Total other long-term liabilities 2,548 2,308
Deferral of EnergyRight laons 1  
Finance Lease, Liability 525 182
Other long-term liabilities    
Other Long-Term Liabilities    
Interest rate swaps 1,927 1,676
Capital lease obligations 171 0
Currency swap liabilities 123 193
EnergyRight financing obligation 78 90
Environmental agreements liability 0 80
Membership interests of VIE subject to mandatory redemption 56 66
Other 193 203
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Interest rate swaps 114 88
Service agreements 15 12
EnergyRight financing obligation $ 19 $ 23
[1] See Note 15 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.