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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Revenues |  |  |
Total operating revenues | $ 9,478 | $ 9,074 | $ 8,915
Operating Costs and Expenses |  |  |
Cost of operations | 7,108 | 6,886 | 6,676
Depreciation and amortization | 421 | 596 | 756
Impairment losses | 99 | 1,534 | 483
Selling, general and administrative | 799 | 836 | 1,032
Reorganization costs | 90 | 44 | 0
Development costs | 11 | 22 | 48
Total operating costs and expenses | 8,528 | 9,918 | 8,995
Other income - affiliate | 0 | 87 | 193
Gain on sale of assets | 32 | 16 | (80)
Operating Income/(Loss) | 982 | (741) | 33
Other Income/(Expense) |  |  |
Equity in earnings/(losses) of unconsolidated affiliates | 9 | (14) | (18)
Impairment losses on investments | (15) | (79) | (268)
Other income, net | 18 | 51 | 47
Loss on debt extinguishment, net | (44) | (49) | (142)
Interest expense | (483) | (557) | (583)
Total other expense | (515) | (648) | (964)
Income/(Loss) from Continuing Operations Before Income Taxes | 467 | (1,389) | (931)
Income tax expense/(benefit) | 7 | (44) | 25
Net Income/(Loss) from Continuing Operations | 460 | (1,345) | (956)
(Loss)/income from discontinued operations, net of income tax | (192) | (992) | 65
Net Income/(Loss) | 268 | (2,337) | (891)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests | 0 | (184) | (117)
Net Income/(Loss) Attributable to NRG Energy, Inc. | 268 | (2,153) | (774)
Dividends for preferred shares | 0 | 0 | 5
Gain on redemption of preferred shares | 0 | 0 | (78)
Income/(Loss) Available for Common Stockholders | $ 268 | $ (2,153) | $ (701)
Earnings/(Loss) Per Share Attributable to NRG Energy, Inc. Common Stockholders |  |  |
Weighted average number of common shares outstanding — basic (in shares) | 304,000,000 | 317,000,000 | 316,000,000
Income/(loss) from continuing operations per weighted average common share — basic (in usd per share) | $ 1.51 | $ (3.66) | $ (2.42)
(Loss)/Income from discontinued operations per weighted average common share — basic (in usd per share) | (0.63) | (3.13) | 0.20
Net Income/(Loss) per Weighted Average Common Share — Basic (in | $ 0.88 | $ (6.79) | $ (2.22)
Weighted average number of common shares outstanding — diluted (in shares) | 308,000,000 | 317,000,000 | 316,000,000
Income/(loss) from continuing operations per weighted average common share — diluted (in usd per share) | $ 1.49 | $ (3.66) | $ (2.42)
(Loss)/income from discontinued operations per weighted average common share — diluted (In usd per share) | (0.62) | (3.13) | 0.20
Net Income/(Loss)/income per weighted average common share — diluted (in usd per share) | 0.87 | (6.79) | (2.22)
Dividends Per Common Share (in usd per share) | $ 0.12 | $ 0.12 | $ 0.24

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