Consolidated Statements of Operations (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
Income Statement [Abstract]        
Operating revenues $ 1,079 $ 1,013 $ 2,854 $ 2,708
Operating expenses:        
Operation and maintenance 419 395 1,193 1,132
Depreciation and amortization 154 144 451 430
General taxes 73 68 225 209
(Gain) on asset dispositions and purchases 0 0 0 (9)
Total operating expenses, net 646 607 1,869 1,762
Operating income 433 406 985 946
Other income (expense):        
Interest, net (99) (97) (296) (284)
Non-operating benefit costs, net 12 4 37 12
Other, net 6 5 17 23
Total other income (expense) (81) (88) (242) (249)
Income before income taxes 352 318 743 697
Provision for income taxes 88 78 179 174
Net income attributable to common shareholders $ 264 $ 240 $ 564 $ 523
Basic earnings per share:        
Net income attributable to common shareholders (dollars per share) [1] $ 1.46 $ 1.33 $ 3.11 $ 2.90
Diluted earnings per share:        
Net income attributable to common shareholders (dollars per share) [1] $ 1.46 $ 1.33 $ 3.11 $ 2.89
Weighted-average common shares outstanding:        
Basic (shares) 181 181 181 181
Diluted (shares) 182 181 181 181
[1] Amounts may not calculate due to rounding.