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Summary of Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,673 | $ 2,963 | $ 2,516 | $ 2,883 | $ 2,710 | $ 3,064 | $ 2,625 | $ 2,862 | $ 11,035 | [1] | $ 11,261 | [1] | $ 10,928 | [1]
Other operating expenses | 809 | 758 | 606 | 779 | 770 | 739 | 684 | 940 | 2,952 |  | 3,133 |  | 2,802 |
Pension and OPEB mark-to-market adjustment | (674) | 0 | 0 | 0 | (144) | 0 | 0 | 0 | (674) |  | (144) |  | (102) |
Provision for depreciation | 310 | 304 | 309 | 297 | 293 | 283 | 283 | 277 | 1,220 |  | 1,136 |  | 1,027 |
Operating Income | 615 | 681 | 585 | 629 | 512 | 710 | 700 | 580 | 2,510 |  | 2,502 |  | 2,428 |
Income before income taxes | (249) | 496 | 422 | 448 | 169 | 520 | 409 | 414 |  |  |  |  |  |
Income taxes | (68) | 107 | 81 | 93 | 35 | 121 | 101 | 233 | 213 |  | 490 |  | 1,715 |
Income (loss) from continuing operations | (181) | 389 | 341 | 355 | 134 | 399 | 308 | 181 | 904 |  | 1,022 |  | (289) |
Discontinued operations (Note 3) | 70 | 2 | (29) | (35) | 4 | (857) | (9) | 1,188 |  |  |  |  |  |
Net Income (Loss) | (111) | 391 | 312 | 320 | 138 | (458) | 299 | 1,369 | 912 |  | 1,348 |  | (1,724) |
Income allocated to preferred stockholders (2) | 0 | 0 | 4 | 5 | 10 | 54 | 165 | 156 | 4 |  | 367 |  | 0 |
Net income (loss) attributable to common stockholders | $ (111) | $ 391 | $ 308 | $ 315 | $ 128 | $ (512) | $ 134 | $ 1,213 | $ 908 |  | $ 981 |  | $ (1,724) |
Earnings (loss) per share of common stock- |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic - Continuing Operations (in dollars per share) | $ (0.33) | $ 0.72 | $ 0.63 | $ 0.66 | $ 0.24 | $ 0.68 | $ 0.30 | $ 0.05 | $ 1.69 |  | $ 1.33 |  | $ (0.65) |
Basic - Discontinued Operations (in dollars per share) | 0.13 | 0.01 | (0.05) | (0.07) | 0.01 | (1.70) | (0.02) | 2.50 | 0.01 |  | 0.66 |  | (3.23) |
Basic - Net Income (Loss) Attributable to Common Stockholders (in dollars per share) | (0.20) | 0.73 | 0.58 | 0.59 | 0.25 | (1.02) | 0.28 | 2.55 | 1.70 |  | 1.99 |  | (3.88) |
Diluted - Continuing Operations (in dollars per share) | (0.33) | 0.72 | 0.63 | 0.66 | 0.24 | 0.68 | 0.30 | 0.05 | 1.67 |  | 1.33 |  | (0.65) |
Diluted - Discontinued Operations (in dollars per share) | 0.13 | 0 | (0.05) | (0.07) | 0.01 | (1.70) | (0.02) | 2.49 | 0.01 |  | 0.66 |  | (3.23) |
Diluted - Net Income (Loss) Attributable to Common Stockholders (in dollars per share) | $ (0.20) | $ 0.72 | $ 0.58 | $ 0.59 | $ 0.25 | $ (1.02) | $ 0.28 | $ 2.54 | $ 1.68 |  | $ 1.99 |  | $ (3.88) |
[1] | Includes excise and gross receipts tax collections of $373 million, $386 million and $370 million in 2019, 2018 and 2017, respectively.

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