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SAN ONOFRE NUCLEAR GENERATING STATION (Tables)
 9 Months Ended
Sep. 30, 2021
Public Utilities, General Disclosures [Abstract]  
Schedule of Nuclear Decommissioning Trusts Investments
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 9.
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
 CostGross
unrealized
gains		Gross
unrealized
losses		Estimated
fair
value
At September 30, 2021:    
Debt securities:    
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1)
$52 $— $— $52 
Municipal bonds(2)
307 14 (1)320 
Other securities(3)
261 10 (1)270 
Total debt securities620 24 (2)642 
Equity securities103 255 (2)356 
Cash and cash equivalents7 — — 7 
Payables, net(2)— — (2)
Total$728 $279 $(4)$1,003 
At December 31, 2020:    
Debt securities:    
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies$64 $1 $— $65 
Municipal bonds308 18 — 326 
Other securities253 17 — 270 
Total debt securities625 36 — 661 
Equity securities112 254 (2)364 
Cash and cash equivalents3 — — 3 
Payables, net(9)— — (9)
Total$731 $290 $(2)$1,019 
(1)    Maturity dates are 2021-2051.
(2)    Maturity dates are 2022-2056.
(3)    Maturity dates are 2021-2072.
Schedule of Sales of Securities By Nuclear Decommissioning Trusts
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)
 Three months ended September 30,Nine months ended September 30,
 2021202020212020
Proceeds from sales$187 $294 $729 $1,091 
Gross realized gains9 9 48 108 
Gross realized losses(1)(2)(4)(13)