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ORGANIZATION AND BASIS OF PRESENTATION - Regulatory Assets on the Balance Sheet (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Regulatory assets on the Balance Sheets |  |
Regulatory Liability | $ (1,826) | $ (2,360)
Regulatory Assets | 82 | 99
Net Regulatory Liabilities included on the Consolidated Balance Sheets | (1,744) | (2,261)
Change | 517 |
Regulatory Assets by Source Not Earning a Current Return | 789 | 545
Change | 244 |
Customer payables for future income taxes |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Liability | (2,369) | (2,605)
Change | 236 |
Nuclear decommissioning and spent fuel disposal costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Liability | (102) | (197)
Change | 95 |
Asset removal costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Liability | (721) | (756)
Change | 35 |
Deferred transmission costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 316 | 298
Change | 18 |
Regulatory Assets by Source Not Earning a Current Return | 29 | 27
Change | 2 |
Deferred generation costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 104 | 214
Change | (110) |
Regulatory Assets by Source Not Earning a Current Return | 5 | 15
Change | (10) |
Deferred distribution costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 136 | 155
Change | (19) |
Contract valuations |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 41 | 51
Change | (10) |
Storm-related costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 748 | 551
Change | 197 |
Regulatory Assets by Source Not Earning a Current Return | 654 | 471
Change | 183 |
Uncollectible and COVID-19 related costs |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 97 | 3
Change | 94 |
Regulatory Assets by Source Not Earning a Current Return | 66 | 0
Change | 66 |
Other |  |
Regulatory assets on the Balance Sheets |  |
Regulatory Assets | 6 | 25
Change | (19) |
Regulatory Assets by Source Not Earning a Current Return | 35 | $ 32
Change | $ 3 |

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- Definition Increase (Decrease) in Regulatory Assets + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The net amount of all regulatory assets less all regulatory 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 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 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=120391452&loc=d3e13212-122682 + 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=121594574&loc=d3e44360-110383 + Details
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