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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Assets, Current | $ 14 |  | $ 14 |  | $ 23
Regulatory assets - noncurrent | 567 |  | 567 |  | 569
Regulatory Liability, Current | 187 |  | 187 |  | 23
Regulatory liabilities-noncurrent | 1,370 |  | 1,370 |  | 1,369
Purchased power and fuel | 259 | $ 292 | 613 | $ 554 |
Removal Costs [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Liability, Current | 0 |  | 0 |  | 0
Regulatory liabilities-noncurrent | 1,035 |  | 1,035 |  | 1,016
Deferred Income Tax Charge [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Liability, Current | 0 |  | 0 |  | 0
Regulatory liabilities-noncurrent | 213 |  | 213 |  | 239
Asset Retirement Obligation Costs [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Liability, Current | 0 |  | 0 |  | 0
Regulatory liabilities-noncurrent | 54 |  | 54 |  | 37
Revenue Subject to Refund [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory liabilities-noncurrent | 0 |  | 0 |  | 0
Other Regulatory Assets (Liabilities) [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Liability, Current | 32 |  | 32 |  | 5
Regulatory liabilities-noncurrent | 68 |  | 68 |  | 77
Regulatory Clause Revenues, under-recovered |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Liability, Current | 155 |  | 155 |  | 18
Deferred Derivative Gain (Loss) [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Assets, Current | 0 |  | 0 |  | 0
Regulatory assets - noncurrent | 11 |  | 11 |  | 124
Pension and Other Postretirement Plans Costs [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Assets, Current | 0 |  | 0 |  | 0
Regulatory assets - noncurrent | 223 |  | 223 |  | 240
Loss on Reacquired Debt [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Assets, Current | 0 |  | 0 |  | 0
Regulatory assets - noncurrent | 24 |  | 24 |  | 25
Environmental Restoration Costs [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Assets, Current | 0 |  | 0 |  | 0
Regulatory assets - noncurrent | 99 |  | 99 |  | 95
Other Regulatory Assets (Liabilities) [Member] |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Regulatory Assets, Current | 14 |  | 14 |  | 23
Regulatory assets - noncurrent | 62 |  | 62 |  | 60
Storm Costs |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 58 |  | 58 |  |
221119 Other Electric Power Generation |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 27 |  | 27 |  | 0
Fire |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 36 |  | 36 |  | 15
pandemic |  |  |  |  |
Regulatory Assets and Liabilities [Line Items] |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | $ 27 |  | $ 27 |  | $ 10

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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