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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Sep. 30, 2012
--- | --- | ---
Current assets |  |
Cash and cash equivalents | $ 912 | $ 868
Restricted cash and investments | 11 | 11
Accounts receivable, net | 1,426 | 1,666
Inventories, net | 1,094 | 1,097
Regulatory assets | 684 | 774
Other current assets | 66 | 90
Total current assets | 4,193 | 4,506
Property, plant, and equipment |  |
Completed plant | 46,087 | 45,917
Less accumulated depreciation | (22,472) | (22,169)
Net completed plant | 23,615 | 23,748
Construction in progress | 5,034 | 4,768
Nuclear fuel | 1,197 | 1,176
Capital leases | 33 | 35
Total property, plant, and equipment, net | 29,879 | 29,727
Investment funds | 1,489 | 1,465
Regulatory and other long-term assets |  |
Regulatory assets | 10,850 | 11,127
Other long-term assets | 522 | 509
Total regulatory and other long-term assets | 11,372 | 11,636
Total assets | 46,933 | 47,334
Current liabilities |  |
Accounts payable and accrued liabilities | 1,491 | 1,922
Environmental cleanup costs - Kingston ash spill | 127 | 126
Accrued interest | 368 | 376
Current portion of leaseback obligations | 439 | 443
Current portion of energy prepayment obligations | 101 | 102
Regulatory liabilities | 194 | 191
Short-term debt, net | 1,000 | 1,507
Current maturities of power bonds | 2,324 | 2,308
Current maturities of long-term debt of variable interest entities | 13 | 13
Total current liabilities | 6,057 | 6,988
Other liabilities |  |
Post-retirement and post-employment benefit obligations | 6,286 | 6,279
Asset retirement obligations | 3,291 | 3,289
Other long-term liabilities | 2,532 | 2,680
Leaseback obligations | 760 | 760
Energy prepayment obligations | 485 | 510
Environmental cleanup costs - Kingston ash spill | 117 | 143
Regulatory liabilities | 99 | 109
Total other liabilities | 13,570 | 13,770
Long-term debt, net |  |
Long-term power bonds, net | 21,222 | 20,269
Long-term debt of variable interest entities | 981 | 981
Total long-term debt, net | 22,203 | 21,250
Total liabilities | 41,830 | 42,008
Proprietary capital |  |
Power program appropriation investment | 283 | 288
Power program retained earnings | 4,249 | 4,492
Total power program proprietary capital | 4,532 | 4,780
Nonpower programs appropriation investment, net | 617 | 620
Accumulated other comprehensive income (loss) | (46) | (74)
Total proprietary capital | 5,103 | 5,326
Total liabilities and proprietary capital | $ 46,933 | $ 47,334

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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