CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenues
Electric	$ 9,575	$ 9,719	$ 9,676
Natural Gas	1,868	1,739	1,650
Other	86	79	78
Total operating revenues	11,529	11,537	11,404
Operating expenses
Electric fuel and purchased power	3,510	3,854	3,757
Cost of natural gas sold and transported	918	843	823
Cost of sales — other	40	35	34
Operating and maintenance expenses	2,338	2,352	2,270
Conservation and demand side management program expenses	285	290	273
Depreciation and amortization	1,765	1,642	1,479
Taxes (other than income taxes)	569	556	545
Total operating expenses	9,425	9,572	9,181
Operating income	2,104	1,965	2,223
Other income (expense), net	16	(14)	(10)
Equity earnings of unconsolidated subsidiaries	39	35	30
Allowance for funds used during construction — equity	77	108	75
Interest charges and financing costs
Interest charges — includes other financing costs of $26, $25 and $24, respectively	773	700	663
Allowance for funds used during construction — debt	(37)	(48)	(35)
Total interest charges and financing costs	736	652	628
Income before income taxes	1,500	1,442	1,690
Income taxes	128	181	542
Net income	$ 1,372	$ 1,261	$ 1,148
Weighted average common shares outstanding:
Basic (in shares)	519	511	509
Diluted (in shares)	520	511	509
Earnings per average common share:
Basic (in dollars per share)	$ 2.64	$ 2.47	$ 2.26
Diluted (in dollars per share)	$ 2.64	$ 2.47	$ 2.25