Business Segments (Tables)

9 Months Ended

Sep. 30, 2011

Business Segments

Financial data by business segment

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Operating revenues:
Regulated electricity segment	$	1,124	$	1,116	$	2,571	$	2,527
All other	1		1		2		5
Total	$	1,125	$	1,117	$	2,573	$	2,532
Net income attributable to common shareholders:
Regulated electricity segment	$	246	$	225	$	318	$	320
All other (a)	9		9		9		23
Total	$	255	$	234	$	327	$	343

	As of September 30, 2011		As of December 31, 2010
Assets:
Regulated electricity segment	$	13,112	$	12,285
All other (a)	38		108
Total	$	13,150	$	12,393

(a) All other activities relate to APSES, SunCor, Pinnacle West and El Dorado.