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Balance Sheet Components (Tables) | 6 Months Ended
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Jun. 30, 2017
Balance Sheet Components [Abstract] |
Schedule of Other Current Assets [Table Text Block] | Other current assets consist of the following (in millions):
| June 30, 2017 |  | December 31, 2016
Prepaid expenses | $ | 34 |  |  | $ | 48 |
Margin deposits | 1 |  |  | 8 |
Assets from price risk management activities | 5 |  |  | 18 |
Other | 3 |  |  | 3 |
Other current assets | $ | 43 |  |  | $ | 77 |
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consists of the following (in millions):
| June 30, 2017 |  | December 31, 2016
Electric utility plant | $ | 9,674 |  |  | $ | 9,534 |
Construction work-in-progress | 346 |  |  | 213 |
Total cost | 10,020 |  |  | 9,747 |
Less: accumulated depreciation and amortization | (3,447 | ) |  | (3,313 | )
Electric utility plant, net | $ | 6,573 |  |  | $ | 6,434 |
Schedule of Regulatory Assets and Liabilities [Text Block] | Regulatory assets and liabilities consist of the following (in millions):
| June 30, 2017 |  | December 31, 2016
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |
Price risk management | $ | 41 |  |  | $ | 156 |  |  | $ | 26 |  |  | $ | 120 |
Pension and other postretirement plans | — |  |  | 229 |  |  | — |  |  | 235 |
Deferred income taxes | — |  |  | 82 |  |  | — |  |  | 86 |
Debt issuance costs | — |  |  | 20 |  |  | — |  |  | 22 |
Other | 6 |  |  | 49 |  |  | 10 |  |  | 35 |
Total regulatory assets | $ | 47 |  |  | $ | 536 |  |  | $ | 36 |  |  | $ | 498 |
Regulatory liabilities: |  |  |  |  |  |  |
Asset retirement removal costs | $ | — |  |  | $ | 910 |  |  | $ | — |  |  | $ | 887 |
Trojan decommissioning activities | 8 |  |  | — |  |  | 18 |  |  | — |
Asset retirement obligations | — |  |  | 51 |  |  | — |  |  | 49 |
Other | 26 |  |  | 28 |  |  | 33 |  |  | 22 |
Total regulatory liabilities | $ | 34 |  | * | $ | 989 |  |  | $ | 51 |  | * | $ | 958 |
* Included in Accrued expenses and other current liabilities in the condensed consolidated balance sheets.
Other Liabilities Disclosure [Text Block] | Accrued expenses and other current liabilities consist of the following (in millions):
| June 30, 2017 |  | December 31, 2016
Regulatory liabilities—current | $ | 34 |  |  | $ | 51 |
Accrued employee compensation and benefits | 52 |  |  | 52 |
Accrued interest payable | 25 |  |  | 25 |
Accrued dividends payable | 31 |  |  | 30 |
Accrued taxes payable | 25 |  |  | 25 |
Other | 59 |  |  | 71 |
Total accrued expenses and other current liabilities | $ | 226 |  |  | $ | 254 |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Components of net periodic benefit cost under the defined benefit pension plan are as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 4 |  |  | $ | 4 |  |  | $ | 8 |  |  | $ | 8 |
Interest cost | 9 |  |  | 8 |  |  | 17 |  |  | 16 |
Expected return on plan assets | (10 | ) |  | (10 | ) |  | (20 | ) |  | (20 | )
Amortization of net actuarial loss | 3 |  |  | 4 |  |  | 6 |  |  | 8 |
Net periodic benefit cost | $ | 6 |  |  | $ | 6 |  |  | $ | 11 |  |  | $ | 12 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499596&loc=d3e42232-110370 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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