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NUCLEAR PLANT (Tables)
3 Months Ended
Sep. 30, 2015
Schedule of Nuclear Decommissioning Trusts Investments [Abstract]  
Schedule of Nuclear Decommissioning Trusts Investments
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
GrossGrossEstimated
unrealizedunrealizedfair
Costgainslossesvalue
At September 30, 2015:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies(1)$90$5$$95
Municipal bonds(2)1477154
Other securities(2)2143(12)205
Total debt securities45115(12)454
Equity securities212382(6)588
Cash and cash equivalents1818
Total $681$397$(18)$1,060
At December 31, 2014:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies$103$6$$109
Municipal bonds1218129
Other securities2067(6)207
Total debt securities43021(6)445
Equity securities215444(4)655
Cash and cash equivalents30131
Total $675$466$(10)$1,131
(1)Maturity dates are 2016-2065.
(2)Maturity dates are 2015-2115.
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 September 30,Nine months ended September 30,
2015201420152014
Proceeds from sales(1)$210$148$431$498
Gross realized gains185249
Gross realized losses(6)(3)(13)(8)
(1)Excludes securities that are held to maturity.