Summarized Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

Summarized Quarterly Financial Data (Unaudited)

	Quarter Ended
(Amounts in millions, except per share data)	March 31, 2018		June 30, 2018		Sept. 30, 2018		Dec. 31, 2018
Operating revenues	$	2,951	$	2,658	$	3,048	$	2,880
Operating income (a)	480		450		696		339
Net income	291		265		491		214
EPS total — basic	$	0.57	$	0.52	$	0.96	$	0.42
EPS total — diluted	0.57		0.52		0.96		0.42
Cash dividends declared per common share	0.38		0.38		0.38		0.38

	Quarter Ended
(Amounts in millions, except per share data)	March 31, 2017		June 30, 2017		Sept. 30, 2017		Dec. 31, 2017
Operating revenues	$	2,946	$	2,645	$	3,017	$	2,796
Operating income (a)	492		466		824		440
Net income	239		227		492		189
EPS total — basic	$	0.47	$	0.45	$	0.97	$	0.37
EPS total — diluted	0.47		0.45		0.97		0.37
Cash dividends declared per common share	0.36		0.36		0.36		0.36

^(a)  In 2018, Xcel Energy implemented ASU No. 2017-07 related to net periodic benefit cost, which resulted in retrospective reclassification of pension costs from O&M expense to other income.