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Segments and Related Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | $ 11,537 | $ 11,404 | $ 11,107
Investment in subsidiaries | $ 141 |  |  |  | $ 140 |  |  |  | 141 | 140 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,642 | 1,479 | 1,303
Total interest charges and financing costs |  |  |  |  |  |  |  |  | 652 | 628 | 620
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 181 | 542 | 581
Net income (loss) | $ 214 | $ 491 | $ 265 | $ 291 | $ 189 | $ 492 | $ 227 | $ 239 | 1,261 | 1,148 | 1,123
Regulated Electric |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 9,720 | 9,678 | 9,501
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,421 | 1,298 | 1,136
Total interest charges and financing costs |  |  |  |  |  |  |  |  | 449 | 449 | 450
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 187 | 528 | 567
Net income (loss) |  |  |  |  |  |  |  |  | 1,177 | 1,066 | 1,067
Regulated Natural Gas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 1,741 | 1,651 | 1,532
Depreciation and amortization |  |  |  |  |  |  |  |  | 212 | 174 | 160
Total interest charges and financing costs |  |  |  |  |  |  |  |  | 61 | 57 | 54
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 28 | 23 | 76
Net income (loss) |  |  |  |  |  |  |  |  | 187 | 182 | 124
All Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 79 | 78 | 76
Depreciation and amortization |  |  |  |  |  |  |  |  | 9 | 7 | 7
Total interest charges and financing costs |  |  |  |  |  |  |  |  | 142 | 122 | 116
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (34) | (9) | (62)
Net income (loss) |  |  |  |  |  |  |  |  | (103) | (100) | (68)
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 11,540 | 11,407 | 11,109
Operating Segments | Regulated Electric |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 9,719 | 9,676 | 9,500
Operating Segments | Regulated Natural Gas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 1,739 | 1,650 | 1,531
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | (3) | (3) | (2)
Intersegment Eliminations [Member] | Regulated Electric |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 1 | 2 | 1
Intersegment Eliminations [Member] | Regulated Natural Gas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | $ 2 | $ 1 | $ 1

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