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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.