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NUCLEAR PLANT (Tables)
3 Months Ended
Jun. 30, 2014
Schedule of Nuclear Decommissioning Trusts Investments [Abstract]  
Schedule of Nuclear Decommissioning Trusts Investments
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
     Gross Gross Estimated
     Unrealized Unrealized Fair
   Cost Gains Losses Value
At June 30, 2014:        
Debt securities:        
Debt securities issued by the U.S. Treasury and other         
U.S. government corporations and agencies(1)$ 101$ 5$$ 106
Municipal bonds(2)  109  6  (1)  114
Other securities(3)  190  8  (2)  196
Total debt securities  400  19  (3)  416
Equity securities  213  440  (1)  652
Cash and cash equivalents  28    28
Total $ 641$ 459$ (4)$ 1,096
At December 31, 2013:        
Debt securities:        
Debt securities issued by the U.S. Treasury and other         
U.S. government corporations and agencies$ 116$ 3$ (2)$ 117
Municipal bonds  110  2  (1)  111
Other securities  155  3  (5)  153
Total debt securities  381  8  (8)  381
Equity securities  207  409  (2)  614
Cash and cash equivalents  39    39
Total $ 627$ 417$ (10)$ 1,034
(1)Maturity dates are 2016-2060
(2)Maturity dates are 2014-2062
(3)Maturity dates are 2014-2096
Schedule of Sales of Securities By Nuclear Decommissioning Trusts [Abstract]  
Schedule of Sales of Securities By Nuclear Decommissioning Trusts
SALES OF SECURITIES
(Dollars in millions)
 Three months ended June 30,Six months ended June 30,
 2014201320142013
Proceeds from sales(1)$ 155$ 192$ 350$ 326
Gross realized gains   6  4  11
Gross realized losses  (1)  (4)  (5)  (7)
(1) Excludes securities that are held to maturity.