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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |
Summary of Revenue | The following table is a summary of SCE's revenue:
| Three months ended September 30, 2018 | Three months ended September 30, 2017
(in millions) | Earning Activities | Cost- Recovery Activities | Total Consolidated | Earning Activities | Cost-Recovery Activities | Total Consolidated
Revenues from contracts with customers 1 | $ | 1,851 |  | $ | 2,255 |  | $ | 4,106 |  | * |  | * |  | * |
Alternative revenue programs and other operating revenue | (74 | ) | 228 |  | 154 |  | * |  | * |  | * |
Total operating revenue | $ | 1,777 |  | $ | 2,483 |  | $ | 4,260 |  | $ | 1,677 |  | $ | 1,975 |  | $ | 3,652 |
* As discussed in Note 1, prior period amounts have not been adjusted under the modified retrospective method.
1 | During the three months ended September 30, 2018, SCE recorded CPUC revenue based on the 2017 authorized revenue requirements adjusted for the July 2017 cost of capital decision and Tax Reform pending the outcome of the 2018 GRC. These revenue adjustments are included in "Revenues from contracts with customers."
| Nine months ended September 30, 2018 | Nine months ended September 30, 2017
(in millions) | Earning Activities | Cost- Recovery Activities | Total Consolidated | Earning Activities | Cost-Recovery Activities | Total Consolidated
Revenues from contracts with customers 1 | $ | 4,921 |  | $ | 4,593 |  | $ | 9,514 |  | * |  | * |  | * |
Alternative revenue programs and other operating revenue | (96 | ) | 199 |  | 103 |  | * |  | * |  | * |
Total operating revenue | $ | 4,825 |  | $ | 4,792 |  | $ | 9,617 |  | $ | 4,813 |  | $ | 4,248 |  | $ | 9,061 |
* As discussed in Note 1, prior period amounts have not been adjusted under the modified retrospective method.
1 | During the nine months ended September 30, 2018, SCE recorded CPUC revenue based on the 2017 authorized revenue requirements adjusted for the July 2017 cost of capital decision and Tax Reform pending the outcome of the 2018 GRC. These revenue adjustments are included in "Revenues from contracts with customers."
Receivables, Accrued Unbilled Revenue and Contract Liabilities | The following table provides a summary of significant changes in SCE's contract liabilities:
(in millions) | 2018
Balance at January 1, | $ | 20 |
Additions | 37 |
Revenue recognized during the period | (35 | )
Balance at September 30, | $ | 22 |
The following table provides information about SCE's receivables, accrued unbilled revenue and contract liabilities related to contracts from customers:
(in millions) | September 30, 2018 |  | December 31, 2017
Receivables: |  |  |
Billed revenue | $ | 907 |  |  | $ | 613 |
Accrued unbilled revenues | 505 |  |  | 212 |
Total receivables | $ | 1,412 |  |  | $ | 825 |
Contract liabilities 1 | $ | 22 |  |  | $ | 20 |
1 | Contract liabilities are included in "Other current liabilities" and "Other deferred credits and long-term liabilities" on the consolidated balance sheets.
Activities in the Allowance for Doubtful Accounts | SCE's contract receivables are shown above, gross of allowance for uncollectible accounts. Activities in the allowance for doubtful accounts for SCE's contracts with customers were as follows:
(in millions) | 2018
Balance at January 1, | $ | 36 |
Charged to costs and expenses | 19 |
Write-offs | (17 | )
Balance at September 30, | $ | 38 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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