Operating Segments (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

(millions)	External Revenue			Comprehensive Income (Loss) Available (Attributable) to Common Shareholder
Three Months Ended September 30, 2019
Electric Operations	$	728		$	169
Gas Distribution		67			(1	)
Corporate and Other		—			(25	)
Adjustments/Eliminations		—			—
Consolidated Total	$	795		$	143
Three Months Ended September 30, 2018
Electric Operations	$	670		$	112
Gas Distribution		69			(7	)
Corporate and Other		—			(1	)
Adjustments/Eliminations		—			(6	)
Consolidated Total	$	739		$	98
Nine Months Ended September 30, 2019
Electric Operations	$	1,875		$	321
Gas Distribution		292			13
Corporate and Other		(1,009	)		(1,364	)
Adjustments/Eliminations		—			(14	)
Consolidated Total	$	1,158		$	(1,044	)
Nine Months Ended September 30, 2018
Electric Operations	$	1,770		$	242
Gas Distribution		304			22
Corporate and Other		—			(1	)
Adjustments/Eliminations		—			(15	)
Consolidated Total	$	2,074		$	248