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NUCLEAR PLANT (Tables)
3 Months Ended
Mar. 31, 2016
Public Utilities General Disclosures [Abstract]  
Schedule of Nuclear Decommissioning Trusts Investments
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
GrossGrossEstimated
unrealizedunrealizedfair
Costgainslossesvalue
At March 31, 2016:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies(1)$101$4$$105
Municipal bonds(2)14610156
Other securities(2)1926(8)190
Total debt securities43920(8)451
Equity securities214413(4)623
Cash and cash equivalents9(1)8
Total $662$433$(13)$1,082
At December 31, 2015:
Debt securities:
Debt securities issued by the U.S. Treasury and other
U.S. government corporations and agencies$89$2$$91
Municipal bonds1488156
Other securities1941(13)182
Total debt securities43111(13)429
Equity securities214412(7)619
Cash and cash equivalents1515
Total $660$423$(20)$1,063
(1)Maturity dates are 2016-2065.
(2)Maturity dates are 2016-2115.
Schedule of Sales of Securities By Nuclear Decommissioning Trusts
SALES OF SECURITIES
(Dollars in millions)
Three months ended March 31,
20162015
Proceeds from sales(1)$93$94
Gross realized gains32
Gross realized losses(8)(4)
(1)Excludes securities that are held to maturity.