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Consolidated Statements of Income (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income Statement [Abstract] |  |  |
Operating revenue | $ 10,577 | $ 9,983 | $ 9,965
Fuel | 367 | 363 | 721
Purchased power | 2,989 | 2,930 | 2,751
Operation and maintenance | 3,387 | 3,291 | 3,154
Depreciation, decommissioning and amortization | 1,426 | 1,273 | 1,178
Property and other taxes | 285 | 263 | 244
Gain on sale of assets | 0 | (1) | (1)
Total operating expenses | 8,454 | 8,119 | 8,047
Operating income | 2,123 | 1,864 | 1,918
Interest income | 5 | 7 | 11
Other income | 135 | 141 | 160
Interest expense | (463) | (429) | (420)
Other expenses | (55) | (51) | (49)
Income before income taxes | 1,745 | 1,532 | 1,620
Income tax expense | 601 | 440 | 249
Net income | 1,144 | 1,092 | 1,371
Less: Net income attributable to noncontrolling interests | 0 | 0 | 94
Dividends on preferred and preference stock | 59 | 52 | 51
Net income available for common stock | $ 1,085 | $ 1,040 | $ 1,226

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