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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | $ 42 | $ 62
Regulatory assets - noncurrent | 426 | 438
Regulatory Liability, Current | 18 | 31
Regulatory liabilities-noncurrent | 1,379 | 1,288
Removal Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Regulatory liabilities-noncurrent | 964 | 933
Deferred Income Tax Charge [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Regulatory liabilities-noncurrent | 271 | 277
Environmental Restoration Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 1 | 3
Regulatory liabilities-noncurrent | 0 | 0
Asset Retirement Obligation Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Regulatory liabilities-noncurrent | 53 | 52
Revenue Subject to Refund [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 37 | 0
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 17 | 28
Regulatory liabilities-noncurrent | 54 | 26
Deferred Derivative Gain (Loss) [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 37 | 53
Regulatory assets - noncurrent | 123 | 151
Pension and Other Postretirement Plans Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory assets - noncurrent | 205 | 218
Loss on Reacquired Debt [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory assets - noncurrent | 17 | 19
Environmental Restoration Costs [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory assets - noncurrent | 26 | 0
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 5 | 9
Regulatory assets - noncurrent | $ 55 | $ 50

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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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