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Consolidated Statements of Income (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Income Statement [Abstract] |  |  |  |
Operating revenue | $ 2,651 | $ 2,446 | $ 5,063 | $ 4,678
Fuel | 61 | 83 | 138 | 159
Purchased power | 822 | 649 | 1,437 | 1,158
Operation and maintenance | 866 | 846 | 1,717 | 1,631
Depreciation, decommissioning and amortization | 399 | 356 | 788 | 700
Property and other taxes | 73 | 69 | 156 | 146
Total operating expenses | 2,221 | 2,003 | 4,236 | 3,794
Operating income | 430 | 443 | 827 | 884
Interest income | 2 | 2 | 3 | 5
Other income | 36 | 39 | 67 | 77
Interest expense | (127) | (117) | (249) | (228)
Other expenses | (19) | (13) | (26) | (25)
Income before income taxes | 322 | 354 | 622 | 713
Income tax expense | 108 | 128 | 208 | 251
Net income | 214 | 226 | 414 | 462
Less: Dividends on preferred and preference stock | 23 | 15 | 41 | 29
Net income available for common stock | $ 191 | $ 211 | $ 373 | $ 433

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- Definition Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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