Utility Plant and Nonutility Property (Tables)

12 Months Ended

Dec. 31, 2020

Utility Plant And Non Utility Property [Abstract]

Property, Plant and Equipment

Major classes of utility plant and other property and their respective balances at December 31, 2020 and 2019 were as follows:

At December 31,	2020		2019
(millions)
Gross utility plant:
Generation	$	5,921	$	5,765
Transmission		1,963		1,905
Distribution		4,909		4,685
Storage		74		73
General and other		563		549
Intangible		250		231
Construction work in progress		460		339
Nuclear fuel		575		608
Total gross utility plant	$	14,715	$	14,155
Gross nonutility property	$	45	$	75

Schedule of Jointly Owned Utility Plants

At December 31,	2020			2019
	Summer Unit 1			Summer Unit 1
Percent owned	66.7%			66.7%
Plant in service	$	1.6	billion	$	1.4	billion
Accumulated depreciation	$	702	million	$	684	million
Construction work in progress	$	62	million	$	79	million