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CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)
Dec. 31, 2020
Sep. 30, 2020
Current assets    
Cash and cash equivalents $ 509,000,000 $ 500,000,000
Accounts receivable, net 1,368,000,000 1,529,000,000
Inventories, net 1,064,000,000 1,003,000,000
Regulatory assets 119,000,000 130,000,000
Other current assets 84,000,000 84,000,000
Total current assets 3,144,000,000 3,246,000,000
Property, plant, and equipment    
Completed plant 65,295,000,000 64,970,000,000
Less accumulated depreciation (33,822,000,000) (33,550,000,000)
Net completed plant 31,473,000,000 31,420,000,000
Construction in progress 2,158,000,000 2,139,000,000
Nuclear fuel 1,463,000,000 1,504,000,000
Capital leases 505,000,000 516,000,000
Total property, plant, and equipment, net 35,599,000,000 35,579,000,000
Investment funds 3,587,000,000 3,198,000,000
Regulatory and other long-term assets    
Regulatory assets 9,697,000,000 10,245,000,000
Operating Lease, Right-of-Use Asset 216,000,000 232,000,000
Other long-term assets 320,000,000 325,000,000
Total regulatory and other long-term assets 10,233,000,000 10,802,000,000
Total assets 52,563,000,000 52,825,000,000
Current liabilities    
Accounts payable and accrued liabilities 1,672,000,000 1,844,000,000
Accrued interest 295,000,000 298,000,000
Asset Retirement Obligation, Current 345,000,000 345,000,000
Current portion of leaseback obligations 219,000,000 198,000,000
Regulatory liabilities 128,000,000 141,000,000
Short-term debt, net 112,000,000 57,000,000
Current maturities of power bonds 1,802,000,000 1,787,000,000
Current maturities of long-term debt of variable interest entities 41,000,000 41,000,000
Total current liabilities 4,614,000,000 4,711,000,000
Other liabilities    
Post-retirement and post-employment benefit obligations 6,496,000,000 6,617,000,000
Asset retirement obligations 6,442,000,000 6,440,000,000
Operating Lease, Liability, Noncurrent 520,000,000  
Operating Lease, Liability, Current   525,000,000
Other long-term liabilities 2,270,000,000 2,548,000,000
Leaseback obligations 4,000,000 25,000,000
Regulatory liabilities 13,000,000 23,000,000
Total other liabilities 15,745,000,000 16,178,000,000
Long-term debt, net    
Long-term power bonds, net 17,988,000,000 17,956,000,000
Long-term debt of variable interest entities, net 1,049,000,000 1,048,000,000
Total long-term debt, net 19,037,000,000 19,004,000,000
Total liabilities 39,396,000,000 39,893,000,000
Proprietary capital    
Power program appropriation investment 258,000,000 258,000,000
Power program retained earnings 12,358,000,000 12,177,000,000
Total power program proprietary capital 12,616,000,000 12,435,000,000
Nonpower programs appropriation investment, net 546,000,000 548,000,000
Accumulated other comprehensive income (loss) 5,000,000 (51,000,000)
Total proprietary capital 13,167,000,000 12,932,000,000
Total liabilities and proprietary capital $ 52,563,000,000 $ 52,825,000,000