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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Results from Operations by Reportable Segment
(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended Sept. 30, 2017
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
877,604

 
$
142,389

 
$
10,300

 
$
—

 
$
1,030,293

Intersegment revenues
 
47

 
222

 
—

 
(269
)
 
—

Total revenues
 
$
877,651

 
$
142,611

 
$
10,300

 
$
(269
)
 
$
1,030,293

Net income
 
$
178,648

 
$
5,815

 
$
1,614

 
$
—

 
$
186,077


(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended Sept. 30, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
897,516

 
$
152,763

 
$
8,898

 
$
—

 
$
1,059,177

Intersegment revenues
 
54

 
6

 
—

 
(60
)
 
—

Total revenues
 
$
897,570

 
$
152,769

 
$
8,898

 
$
(60
)
 
$
1,059,177

Net income (loss)
 
$
168,328

 
$
4,918

 
$
361

 
$
—

 
$
173,607


(a)    Operating revenues include $0 and $2 million of affiliate electric revenue for the three months ended Sept. 30, 2017 and 2016.
(b)    Operating revenues include $1 million of other affiliate revenue for the three months ended Sept. 30, 2017 and 2016.
(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Nine Months Ended Sept. 30, 2017
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
2,318,912

 
$
691,302

 
$
31,529

 
$
—

 
$
3,041,743

Intersegment revenues
 
206

 
318

 
—

 
(524
)
 
—

Total revenues
 
$
2,319,118

 
$
691,620

 
$
31,529

 
$
(524
)
 
$
3,041,743

Net income
 
$
342,195

 
$
53,133

 
$
2,882

 
$
—

 
$
398,210

(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Nine Months Ended Sept. 30, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
2,337,547

 
$
659,738

 
$
29,585

 
$
—

 
$
3,026,870

Intersegment revenues
 
196

 
84

 
—

 
(280
)
 
—

Total revenues
 
$
2,337,743

 
$
659,822

 
$
29,585

 
$
(280
)
 
$
3,026,870

Net income
 
$
320,192

 
$
53,883

 
$
2,750

 
$
—

 
$
376,825


(a)    Operating revenues include $1 million and $7 million of affiliate electric revenue for the nine months ended Sept. 30, 2017 and 2016, respectively.
(b)    Operating revenues include $3 million of other affiliate revenue for the nine months ended Sept. 30, 2017 and 2016.