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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Data [Abstract]                      
Revenues $ 2,710 $ 3,064 $ 2,625 $ 2,862 $ 2,681 $ 2,910 $ 2,561 $ 2,776 $ 11,261 [1] $ 10,928 [1] $ 10,700 [1]
Other operating expenses 770 739 684 940 803 651 657 650 3,133 2,761 2,579
Pension and OPEB mark-to-market adjustment (144) 0 0 0 (102) 0 0 0 (144) (102) (102)
Provision for depreciation 293 283 283 277 262 261 254 250 1,136 1,027 933
Impairment of assets and related charges 0 0 0 0 28 13 0 0 0 41 43
Operating Income 512 710 700 580 505 733 574 616 2,502 2,428 2,054
Income before income taxes 169 520 409 414 171 503 352 400      
Income taxes (13) 133 121 249 1,232 202 132 149 490 1,715 527
Income (loss) from continuing operations 182 387 288 165 (1,061) 301 220 251 1,022 (289) 551
Discontinued operations (Note 3) (44) (845) 11 1,204 (1,438) 95 (46) (46)      
Net Income (Loss) 138 (458) 299 1,369 (2,499) 396 174 205 1,348 (1,724) (6,177)
Income allocated to preferred shareholders (2) 10 54 165 156 0 0 0 0      
Net income (loss) attributable to common shareholders $ 128 $ (512) $ 134 $ 1,213 $ (2,499) $ 396 $ 174 $ 205 $ 981 $ (1,724) $ (6,177)
Earnings (loss) per share of common stock-                      
Basic - Continuing Operations, in dollars per share $ 0.34 $ 0.66 $ 0.27 $ 0.01 $ (2.39) $ 0.68 $ 0.49 $ 0.57 $ 1.33 $ (0.65) $ 1.29
Basic - Discontinued Operations, in dollars per share (0.09) (1.68) 0.01 2.54 (3.23) 0.21 (0.10) (0.11) 0.66 (3.23) (15.78)
Basic - Net Income (Loss) Attributable to Common Stockholders, in dollars per share 0.25 (1.02) 0.28 2.55 (5.62) 0.89 0.39 0.46 1.99 (3.88) (14.49)
Diluted - Continuing Operations, in dollars per share 0.34 0.66 0.27 0.01 (2.39) 0.68 0.49 0.57 1.33 (0.65) 1.29
Diluted - Discontinued Operations, in dollars per share (0.09) (1.68) 0.01 2.53 (3.23) 0.21 (0.10) (0.11) 0.66 (3.23) (15.78)
Diluted - Net Income (Loss) Attributable to Common Stockholders, in dollars per share $ 0.25 $ (1.02) $ 0.28 $ 2.54 $ (5.62) $ 0.89 $ 0.39 $ 0.46 $ 1.99 $ (3.88) $ (14.49)
[1] Includes excise and gross receipts tax collections of $386 million, $370 million and $378 million in 2018, 2017 and 2016, respectively.