CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating revenues
Electric	$ 2,270	$ 2,299
Natural gas	662	626
Other	19	21
Total operating revenues	2,951	2,946
Operating expenses
Electric fuel and purchased power	932	925
Cost of natural gas sold and transported	375	365
Cost of sales — other	8	9
Operating and maintenance expenses	557	580
Conservation and demand side management expenses	71	68
Depreciation and amortization	383	365
Taxes (other than income taxes)	145	142
Total operating expenses	2,471	2,454
Operating income	480	492
Other income, net	1	1
Equity earnings of unconsolidated subsidiaries	6	8
Allowance for funds used during construction — equity	23	14
Interest charges and financing costs
Interest charges — includes other financing costs of $6 and $6, respectively	171	166
Allowance for funds used during construction — debt	(11)	(7)
Total interest charges and financing costs	160	159
Income before income taxes	350	356
Income taxes	59	117
Net income	$ 291	$ 239
Weighted average common shares outstanding:
Basic (in shares)	509.0	508.3
Diluted (in shares)	509.0	508.8
Earnings per average common share:
Basic (in dollars per share)	$ 0.57	$ 0.47
Diluted (in dollars per share)	0.57	0.47
Cash dividends declared per common share (in dollars per share)	$ 0.38	$ 0.36