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Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Regulatory Assets [Line Items] |  |
Regulatory Assets | $ 500 | $ 462
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 438 |
Regulatory Liabilities | 1,421 | 1,391
Regulatory Assets Earning a Rate of Return at the Approved Rate | 1,405 |
Removal Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
Regulatory Liabilities | 1,021 | 979
Deferred Income Tax Charge [Member] |  |
Regulatory Assets [Line Items] |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
Regulatory Liabilities | 260 | 267
Asset Retirement Obligation Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
Regulatory Liabilities | $ 54 | 53
Revenue Subject to Refund [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Current Asset, End Date for Recovery | 2020 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 0 |
Regulatory Liabilities | 23 | 45
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets [Line Items] |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 16 |
Regulatory Liabilities | 63 | 47
Regulatory Assets Earning a Rate of Return at the Approved Rate | 47 |
Other Regulatory Assets Earning a Return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 62 |
Earning a return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | $ 62 |
Deferred Derivative Gain (Loss) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Current Asset, End Date for Recovery | 2035 |
Regulatory Assets | $ 0 | 131
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 95 |
Pension and Other Postretirement Plans Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 | 222
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 213 |
Loss on Reacquired Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Current Asset, End Date for Recovery | 2049 |
Regulatory Assets | $ 0 | 16
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 26 |
Environmental Restoration Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Current Asset, End Date for Recovery | 2059 |
Regulatory Assets | $ 0 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 94 | 26
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 72 | $ 67
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 10 |

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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 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 The end date for recovery of the individual regulatory current asset in a schedule of regulatory current assets. + 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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