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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | $ 21 | $ 17
Regulatory assets - noncurrent | 513 | 483
Regulatory Liability, Current | 40 | 44
Regulatory liabilities-noncurrent | 1,390 | 1,377
Removal Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Regulatory liabilities-noncurrent | 1,033 | 1,021
Deferred Income Tax Charge [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Regulatory liabilities-noncurrent | 259 | 260
Asset Retirement Obligation Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Regulatory liabilities-noncurrent | 54 | 54
Revenue Subject to Refund [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 17 | 23
Regulatory liabilities-noncurrent | 0 | 0
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 23 | 21
Regulatory liabilities-noncurrent | 44 | 42
Deferred Derivative Gain (Loss) [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 7 | 0
Regulatory assets - noncurrent | 124 | 95
Pension and Other Postretirement Plans Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory assets - noncurrent | 208 | 213
Loss on Reacquired Debt [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory assets - noncurrent | 25 | 26
Environmental Restoration Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory assets - noncurrent | 95 | 94
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 14 | 17
Regulatory assets - noncurrent | $ 61 | $ 55

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + 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 The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities 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 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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