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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2020
Balance Sheet Components [Abstract] |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | The following is the activity in the allowance for uncollectible accounts (in millions):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Balance as of beginning of year | $ | 5 |  |  | $ | 15 |  |  | $ | 6 |
Increase in provision * | 15 |  |  | 2 |  |  | 14 |
Amounts written off, less recoveries | (4) |  |  | (12) |  |  | (5) |
Balance as of end of year | $ | 16 |  |  | $ | 5 |  |  | $ | 15 |
Schedule of Other Assets and Other Liabilities [Table Text Block] | Other current assets and Accrued expenses and other current liabilities consist of the following (in millions):
| As of December 31,
| 2020 |  | 2019
Other current assets: |  |  |
Prepaid expenses | $ | 57 |  |  | $ | 63 |
Margin deposits | 8 |  |  | 16 |
Assets from price risk management activities | 33 |  |  | 25 |
| $ | 98 |  |  | $ | 104 |
Accrued expenses and other current liabilities: |  |  |
Regulatory liabilities—current | $ | 23 |  |  | $ | 44 |
Accrued employee compensation and benefits | 67 |  |  | 74 |
Accrued dividends payable | 38 |  |  | 36 |
Accrued interest payable | 29 |  |  | 25 |
Accrued taxes payable | 36 |  |  | 33 |
Other | 129 |  |  | 103 |
| $ | 322 |  |  | $ | 315 |
Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consist of the following (in millions):
| As of December 31,
| 2020 |  | 2019
Electric utility plant: |  |  |
Generation | $ | 4,436 |  |  | $ | 4,749 |
Transmission | 970 |  |  | 848 |
Distribution | 4,136 |  |  | 3,917 |
General | 679 |  |  | 656 |
Intangible | 753 |  |  | 758 |
Total in service | 10,974 |  |  | 10,928 |
Accumulated depreciation and amortization | (3,864) |  |  | (4,095) |
Total in service, net | 7,110 |  |  | 6,833 |
Construction work-in-progress | 429 |  |  | 328 |
Electric utility plant, net | $ | 7,539 |  |  | $ | 7,161 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167750&loc=d3e42232-110370 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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