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Other Long-Term Liabilities Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Other Long-Term Liabilities    
Interest rate swaps $ 905 $ 1,639
Derivative Liability (734)  
Currency swap liabilities 240 83 [1]
EnergyRight financing obligation (81) (92)
Deferred Revenue, Noncurrent 39 37
Non-current regulatory liabilities 172 40
Total other long-term liabilities 1,485 $ 2,041
Finance Lease, Liability $ 687  
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Deferred Compensation Liability, Current $ (53) $ (51)
Current portion of energy prepayment obligations 16 17
Change in currency swap liabilities 157  
Other long-term liabilities    
Other Long-Term Liabilities    
Interest rate swaps 851 1,524
Currency swap liabilities 228 76
EnergyRight financing obligation (58) (66)
Environmental agreements liability 39 42
Customer Advances for Construction 53 24
Membership interests of VIE subject to mandatory redemption 0 29
Other 124 121
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Interest rate swaps 54 115
Service agreements (32) (28)
EnergyRight financing obligation (14) (16)
Customer Advances for Construction $ 33 $ 38
[1] See Note 15 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.