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Balance Sheet Components (Tables) | 6 Months Ended
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Jun. 30, 2018
Balance Sheet Components [Abstract] |
Schedule of Other Current Assets [Table Text Block] | Other current assets consist of the following (in millions):
| June 30, 2018 |  | December 31, 2017
Prepaid expenses | $ | 38 |  |  | $ | 50 |
Assets from price risk management activities | 3 |  |  | 6 |
Margin deposits | 7 |  |  | 11 |
Other | 8 |  |  | 6 |
Other current assets | $ | 56 |  |  | $ | 73 |
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consists of the following (in millions):
| June 30, 2018 |  | December 31, 2017
Electric utility plant | $ | 10,257 |  |  | $ | 9,914 |
Construction work-in-progress | 290 |  |  | 391 |
Total cost | 10,547 |  |  | 10,305 |
Less: accumulated depreciation and amortization | (3,707 | ) |  | (3,564 | )
Electric utility plant, net | $ | 6,840 |  |  | $ | 6,741 |
Schedule of Regulatory Assets and Liabilities [Text Block] | Regulatory assets and liabilities consist of the following (in millions):
| June 30, 2018 |  | December 31, 2017
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |
Price risk management | $ | 48 |  |  | $ | 135 |  |  | $ | 53 |  |  | $ | 151 |
Pension and other postretirement plans | — |  |  | 209 |  |  | — |  |  | 218 |
Debt issuance costs | — |  |  | 17 |  |  | — |  |  | 19 |
Trojan decommissioning activities | — |  |  | 26 |  |  | — |  |  | — |
Other | 8 |  |  | 54 |  |  | 9 |  |  | 50 |
Total regulatory assets | $ | 56 |  |  | $ | 441 |  |  | $ | 62 |  |  | $ | 438 |
Regulatory liabilities: |  |  |  |  |  |  |
Asset retirement removal costs | $ | — |  |  | $ | 955 |  |  | $ | — |  |  | $ | 933 |
Deferred income taxes | — |  |  | 272 |  |  | — |  |  | 277 |
Trojan decommissioning activities | 2 |  |  | — |  |  | 3 |  |  | — |
Asset retirement obligations | — |  |  | 53 |  |  | — |  |  | 52 |
Tax Reform Deferral(1) | — |  |  | 25 |  |  | — |  |  | — |
Other | 20 |  |  | 43 |  |  | 28 |  |  | 26 |
Total regulatory liabilities | $ | 22 |  | (2) | $ | 1,348 |  |  | $ | 31 |  | (2) | $ | 1,288 |
(1) Related to the deferral of the 2018 net tax benefits due to the change in corporate tax rate under TCJA. (2) 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, 2018 |  | December 31, 2017
Accrued employee compensation and benefits | $ | 54 |  |  | $ | 60 |
Accrued taxes payable | 25 |  |  | 31 |
Accrued interest payable | 27 |  |  | 27 |
Accrued dividends payable | 33 |  |  | 31 |
Regulatory liabilities—current | 22 |  |  | 31 |
Other | 64 |  |  | 61 |
Total accrued expenses and other current liabilities | $ | 225 |  |  | $ | 241 |
Schedule of Asset Retirement Obligations [Table Text Block] | Asset retirement obligations (AROs) consist of the following (in millions):
| June 30, 2018 |  | December 31, 2017
Trojan decommissioning activities | $ | 69 |  |  | $ | 45 |
Utility plant | 110 |  |  | 109 |
Non-utility property | 13 |  |  | 13 |
Asset retirement obligations | $ | 192 |  |  | $ | 167 |
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 5 |  |  | $ | 4 |  |  | $ | 10 |  |  | $ | 8 |
Interest cost* | 8 |  |  | 9 |  |  | 16 |  |  | 17 |
Expected return on plan assets* | (11 | ) |  | (10 | ) |  | (21 | ) |  | (20 | )
Amortization of net actuarial loss* | 4 |  |  | 3 |  |  | 8 |  |  | 6 |
Net periodic benefit cost | $ | 6 |  |  | $ | 6 |  |  | $ | 13 |  |  | $ | 11 |
* The expense portion of non-service cost components are included in Miscellaneous income (expense), net within Other income on the Company’s condensed consolidated statements of income and comprehensive income pursuant to ASU 2017-07. See Note 1, Basis of Presentation for additional information.

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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 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + 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=84167750&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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