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Summary of Significant Accounting Policies Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Regulatory Assets and Liabilities [Line Items] |  |
Current regulatory assets | $ 66 | $ 60
Non-current regulatory assets | 245 | 288
Total regulatory assets(a) | 311 | 348
Current regulatory liabilities | 29 | 107
Non-current regulatory liabilities | 206 | 236
Total regulatory liabilities(b) | 235 | $ 343
Regulatory assets recoverable without earning a return | $ 98 |
Regulatory assets, weighted average remaining recovery period | 23 years |
Remaining Amounts of Regulatory Liabilities Subject to Crediting Period | $ 136 |
Remaining Recovery Period of Regulatory Liabilities Subject to Defined Crediting Period | 18 years |
Remaining Amounts of Regulatory Liabilities Not Subject to Defined Crediting Period | $ 70 |
Loss on Disposal of Assets [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total regulatory assets(a) | 176 |
Income Tax Gross Up on AFUDC Equity [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total regulatory assets(a) | 53 |
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Total regulatory assets(a) | $ 82 |

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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 Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82849221&loc=d3e44360-110383 + Details
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