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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | EDISON INTERNATIONAL SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
|  |  | Additions |  |  |  |
(in millions) | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
For the Year ended December 31, 2017 |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  |  |  |  |  |  |  |  |
Customers | $ | 41.2 |  |  | $ | 12.9 |  |  | $ | — |  |  | $ | 17.5 |  |  | $ | 36.6 |
All others | 20.6 |  |  | 13.5 |  |  | — |  |  | 16.8 |  |  | 17.3 |
Total allowance for uncollectible amounts | $ | 61.8 |  |  | $ | 26.4 |  |  | $ | — |  |  | $ | 34.3 |  | a | $ | 53.9 |
Tax valuation allowance | $ | 24.0 |  |  | $ | — |  |  | $ | 4.0 |  | c | $ | — |  |  | $ | 28.0 |
For the Year ended December 31, 2016 |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  |  |  |  |  |  |  |  |
Customers | $ | 46.2 |  |  | $ | 17.7 |  |  | $ | — |  |  | $ | 22.7 |  |  | $ | 41.2 |
All others | 15.5 |  |  | 15.9 |  |  | — |  |  | 10.8 |  |  | 20.6 |
Total allowance for uncollectible amounts | $ | 61.7 |  |  | $ | 33.6 |  |  | $ | — |  |  | $ | 33.5 |  | a | $ | 61.8 |
Tax valuation allowance | $ | 32.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 8.0 |  | b | $ | 24.0 |
For the Year ended December 31, 2015 |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  |  |  |  |  |  |  |  |
Customers | $ | 48.9 |  |  | $ | 23.9 |  |  | $ | — |  |  | $ | 26.6 |  |  | $ | 46.2 |
All others | 23.3 |  |  | 18.0 |  |  | — |  |  | 25.8 |  |  | 15.5 |
Total allowance for uncollectible amounts | $ | 72.2 |  |  | $ | 41.9 |  |  | $ | — |  |  | $ | 52.4 |  | a | $ | 61.7 |
Tax valuation allowance | $ | 29.0 |  |  | $ | 3.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 32.0 |
a | Accounts written off, net.
b | In 2016, Edison International determined that $8 million of the assets subject to a valuation allowance had no expectation of recovery and were written off.
c | As a result of Tax Reform, Edison International recorded an additional valuation allowance of $4 million for non-California state net operating loss carryforwards estimated to expire unused.
SOUTHERN CALIFORNIA EDISON COMPANY SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
|  |  | Additions |  |  |  |
(in millions) | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
For the Year ended December 31, 2017 |  |  |  |  |  |  |  |  |
For the Year ended |  |  |  |  |  |  |  |  |
Customers | $ | 40.5 |  |  | $ | 12.9 |  |  | $ | — |  |  | $ | 17.4 |  |  | $ | 36.0 |
All others | 20.6 |  |  | 13.5 |  |  | — |  |  | 16.8 |  |  | 17.3 |
Total allowance for uncollectible accounts | $ | 61.1 |  |  | $ | 26.4 |  |  | $ | — |  |  | $ | 34.2 |  | a | $ | 53.3 |
For the Year ended December 31, 2016 |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  |  |  |  |  |  |  |  |
Customers | $ | 46.2 |  |  | $ | 17.0 |  |  | $ | — |  |  | $ | 22.7 |  |  | $ | 40.5 |
All others | 15.5 |  |  | 15.9 |  |  | — |  |  | 10.8 |  |  | 20.6 |
Total allowance for uncollectible accounts | $ | 61.7 |  |  | $ | 32.9 |  |  | $ | — |  |  | $ | 33.5 |  | a | $ | 61.1 |
For the Year ended December 31, 2015 |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  |  |  |  |  |  |  |  |
Customers | $ | 48.9 |  |  | $ | 23.9 |  |  | $ | — |  |  | $ | 26.6 |  |  | $ | 46.2 |
All others | 18.7 |  |  | 18.0 |  |  | — |  |  | 21.2 |  |  | 15.5 |
Total allowance for uncollectible accounts | $ | 67.6 |  |  | $ | 41.9 |  |  | $ | — |  |  | $ | 47.8 |  | a | $ | 61.7 |
a | Accounts written off, net.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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