INCOME TAXES (Income Tax Expense Included in Income Statements) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current Tax Expense (Benefit)
Federal	$ (11,000,000)	$ (2,000,000)	$ (7,000,000)
State	(2,000,000)	(2,000,000)	(2,000,000)
Total	(13,000,000)	(4,000,000)	(9,000,000)
Deferred Tax Expense (Benefit)
Federal	61,000,000	51,000,000	64,000,000
Investment Tax Credit	(1,000,000)	0	(1,000,000)
State	11,000,000	9,000,000	13,000,000
Total	71,000,000	60,000,000	76,000,000
Income Tax Expense (Benefit)	58,427,000	55,727,000	66,951,000
TUCSON ELECTRIC POWER COMPANY
Current Tax Expense (Benefit)
Federal	(8,000,000)	(4,000,000)	(5,000,000)
State	(2,000,000)	(2,000,000)	(2,000,000)
Total	(10,000,000)	(6,000,000)	(7,000,000)
Deferred Tax Expense (Benefit)
Federal	47,000,000	38,000,000	50,000,000
Investment Tax Credit	(1,000,000)	0	(1,000,000)
State	12,000,000	7,000,000	10,000,000
Total	58,000,000	45,000,000	59,000,000
Income Tax Expense (Benefit)	$ 47,986,000	$ 39,109,000	$ 52,000,000