Segment Information (Tables)
 12 Months Ended
Dec. 31, 2019
Segment Reporting [Abstract]  
Summarized Segment Information
Presented in the tables below is summarized segment information as of and for the years ended December 31:
 
2019
 
Regulated
Businesses
 
Market-Based
Businesses
 
Other
 
Consolidated
Operating revenues
$
3,094

 
$
539

 
$
(23
)
 
$
3,610

Depreciation and amortization
529

 
37

 
16

 
582

Total operating expenses, net
1,964

 
480

 
(4
)
 
2,440

Interest, net
(295
)
 
5

 
(92
)
 
(382
)
Income before income taxes
869

 
66

 
(102
)
 
833

Provision for income taxes
215

 
20

 
(23
)
 
212

Net income attributable to common shareholders
654

 
46

 
(79
)
 
621

Total assets
20,318

 
1,008

 
1,356

 
22,682

Cash paid for capital expenditures
1,627

 
13

 
14

 
1,654

 
2018
 
Regulated
Businesses
 
Market-Based
Businesses
 
Other
 
Consolidated
Operating revenues
$
2,984

 
$
476

 
$
(20
)
 
$
3,440

Depreciation and amortization
500

 
29

 
16

 
545

Impairment charge
—

 
57

 
—

 
57

Total operating expenses, net
1,912

 
441

 
(15
)
 
2,338

Interest, net
(280
)
 
4

 
(74
)
 
(350
)
Income before income taxes
826

 
41

 
(80
)
 
787

Provision for income taxes
224

 
11

 
(13
)
 
222

Net income attributable to common shareholders
602

 
32

 
(67
)
 
567

Total assets
18,680

 
999

 
1,544

 
21,223

Cash paid for capital expenditures
1,477

 
13

 
96

 
1,586

 
2017
 
Regulated
Businesses
 
Market-Based
Businesses
 
Other
 
Consolidated
Operating revenues
$
2,958

 
$
422

 
$
(23
)
 
$
3,357

Depreciation and amortization
462

 
18

 
12

 
492

Total operating expenses, net
1,766

 
360

 
(22
)
 
2,104

Interest, net
(268
)
 
3

 
(77
)
 
(342
)
Income before income taxes
925

 
66

 
(79
)
 
912

Provision for income taxes
366

 
28

 
92

 
486

Net income attributable to common shareholders
559

 
38

 
(171
)
 
426

Total assets
17,602

 
599

 
1,281

 
19,482

Cash paid for capital expenditures
1,316

 
18

 
100

 
1,434