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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Operating revenues |  |  |  |
Electric | $ 2,941 | $ 2,771 | $ 7,430 | $ 7,345
Natural gas | 219 | 222 | 1,082 | 1,324
Other | 22 | 20 | 67 | 62
Total operating revenues | 3,182 | 3,013 | 8,579 | 8,731
Operating expenses |  |  |  |
Electric fuel and purchased power | 981 | 952 | 2,611 | 2,679
Cost of natural gas sold and transported | 54 | 55 | 425 | 646
Cost of sales — other | 11 | 9 | 28 | 28
Operating and maintenance expenses | 579 | 580 | 1,708 | 1,764
Conservation and demand side management expenses | 73 | 75 | 215 | 212
Depreciation and amortization | 513 | 447 | 1,449 | 1,319
Taxes, Other | 158 | 137 | 453 | 429
Total operating expenses | 2,369 | 2,255 | 6,889 | 7,077
Operating income | 813 | 758 | 1,690 | 1,654
Other income (expense), net | 1 | 8 | (6) | 14
Equity earnings of unconsolidated subsidiaries | 12 | 10 | 29 | 29
Allowance for funds used during construction — equity | 30 | 15 | 91 | 55
Interest charges and financing costs |  |  |  |
Interest charges — includes other financing costs of $7, $6, $21 and $19, respectively | 221 | 199 | 628 | 578
Other financing costs | 7 | 6 | 21 | 19
Allowance for funds used during construction — debt | (11) | (7) | (33) | (27)
Total interest charges and financing costs | 210 | 192 | 595 | 551
Income before income taxes | 646 | 599 | 1,209 | 1,201
Income tax expense | 43 | 72 | 24 | 121
Net income | $ 603 | $ 527 | $ 1,185 | $ 1,080
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 526 | 519 | 526 | 517
Diluted (in shares) | 528 | 521 | 527 | 518
Earnings per average common share: |  |  |  |
Basic (in dollars per share) | $ 1.15 | $ 1.02 | $ 2.25 | $ 2.09
Diluted (in dollars per share) | $ 1.14 | $ 1.01 | $ 2.25 | $ 2.08

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