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NUCLEAR PLANT (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2014:        
Debt securities:        
Debt securities issued by the U.S. Treasury and other         
U.S. government corporations and agencies(1)$ 109$ 3$ (1)$ 111
Municipal bonds(2)  108  5  (1)  112
Other securities(3)  176  5  (3)  178
Total debt securities  393  13  (5)  401
Equity securities  210  414  (1)  623
Cash and cash equivalents  31    31
Total $ 634$ 427$ (6)$ 1,055
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 2015-2056.
(2)Maturity dates are 2014-2062.
(3)Maturity dates are 2014-2111.
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 March 31,
 20142013
Proceeds from sales(1)$ 195$ 134
Gross realized gains  4  5
Gross realized losses  (4)  (3)
(1) Excludes securities that are held to maturity.