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SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulated Operations [Abstract] |
Schedule of Nuclear Decommissioning Trusts | The following table shows the fair values and gross unrealized gains and losses for the securities held in the NDT. We provide additional fair value disclosures for the NDT in Note 12.
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Estimated fair value
At December 31, 2018: |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |
Debt securities issued by the U.S. Treasury and other |  |  |  |  |  |  |
U.S. government corporations and agencies(1) | $ | 52 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 53 |
Municipal bonds(2) | 266 |  |  | 4 |  |  | (1 | ) |  | 269 |
Other securities(3) | 238 |  |  | 1 |  |  | (5 | ) |  | 234 |
Total debt securities | 556 |  |  | 6 |  |  | (6 | ) |  | 556 |
Equity securities | 168 |  |  | 253 |  |  | (10 | ) |  | 411 |
Cash and cash equivalents | 7 |  |  | — |  |  | — |  |  | 7 |
Total | $ | 731 |  |  | $ | 259 |  |  | $ | (16 | ) |  | $ | 974 |
At December 31, 2017: |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |
Debt securities issued by the U.S. Treasury and other |  |  |  |  |  |  |
U.S. government corporations and agencies | $ | 54 |  |  | $ | — |  |  | $ | — |  |  | $ | 54 |
Municipal bonds | 245 |  |  | 7 |  |  | (2 | ) |  | 250 |
Other securities | 215 |  |  | 3 |  |  | (1 | ) |  | 217 |
Total debt securities | 514 |  |  | 10 |  |  | (3 | ) |  | 521 |
Equity securities | 171 |  |  | 326 |  |  | (1 | ) |  | 496 |
Cash and cash equivalents | 16 |  |  | — |  |  | — |  |  | 16 |
Total | $ | 701 |  |  | $ | 336 |  |  | $ | (4 | ) |  | $ | 1,033 |
(1) | Maturity dates are 2019-2048.
(2) | Maturity dates are 2019-2056.
(3) Maturity dates are 2019-2064.
Schedule of Securities Sold | The following table shows the proceeds from sales of securities in the NDT and gross realized gains and losses on those sales.
SALES OF SECURITIES IN THE NDT
(Dollars in millions)
| Years ended December 31,
| 2018 |  | 2017 |  | 2016
Proceeds from sales | $ | 890 |  |  | $ | 1,314 |  |  | $ | 1,134 |
Gross realized gains | 42 |  |  | 157 |  |  | 111 |
Gross realized losses | (10 | ) |  | (14 | ) |  | (29 | )

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of not readily marketable securities and investments including, but not limited to, description of security or investment, fair value and value as measured by quoted price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 820 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710923&loc=d3e45360-110995 + Details
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