In the following tables, revenue is classified by the type of goods/services rendered and market/customer type. The tables also reconcile revenue to the reportable segments.



	Three Months Ended June 30, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	678	$	157	$	9	$	844
Commercial and industrial (C&I)	1,206		82		5		1,293
Other	33		—		2		35
Total retail	1,917		239		16		2,172
Wholesale	194		—		—		194
Transmission	132		—		—		132
Other	24		23		—		47
Total revenue from contracts with customers	2,267		262		16		2,545
Alternative revenue and other	81		30		2		113
Total revenues	$	2,348	$	292	$	18	$	2,658



	Three Months Ended June 30, 2017
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	654	$	163	$	9	$	826
C&I	1,243		85		4		1,332
Other	33		—		1		34
Total retail	1,930		248		14		2,192
Wholesale	172		—		—		172
Transmission	126		—		—		126
Other	27		23		—		50
Total revenue from contracts with customers	2,255		271		14		2,540
Alternative revenue and other	83		19		3		105
Total revenues	$	2,338	$	290	$	17	$	2,645



	Six Months Ended June 30, 2018
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,365	$	547	$	18	$	1,930
C&I	2,318		289		12		2,619
Other	66		—		4		70
Total retail	3,749		836		34		4,619
Wholesale	382		—		—		382
Transmission	255		—		—		255
Other	63		51		—		114
Total revenue from contracts with customers	4,449		887		34		5,370
Alternative revenue and other	168		67		4		239
Total revenues	$	4,617	$	954	$	38	$	5,609



	Six Months Ended June 30, 2017
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	1,339	$	537	$	17	$	1,893
C&I	2,391		280		13		2,684
Other	65		—		3		68
Total retail	3,795		817		33		4,645
Wholesale	353		—		—		353
Transmission	247		—		—		247
Other	52		47		—		99
Total revenue from contracts with customers	4,447		864		33		5,344
Alternative revenue and other	190		51		6		247
Total revenues	$	4,637	$	915	$	39	$	5,591