Nuclear Decommissioning Trusts (Tables)

3 Months Ended

Mar. 31, 2014

Nuclear Decommissioning Trusts

Fair value of APS's nuclear decommissioning trust fund assets

The following table includes the unrealized gains and losses based on the original cost of the investment and summarizes the fair value of APS’s nuclear decommissioning trust fund assets at March 31, 2014 and December 31, 2013 (dollars in millions):

	Fair Value			Total Unrealized Gains		Total Unrealized Losses
March 31, 2014
Equity securities	$	277		$	132	$	—
Fixed income securities	386			13		(3		)
Net payables (a)	(5		)	—		—
Total	$	658		$	145	$	(3	)

(a) Net payables relate to pending securities sales and purchases.

	Fair Value			Total Unrealized Gains		Total Unrealized Losses
December 31, 2013
Equity securities	$	272		$	129	$	—
Fixed income securities	373			11		(6		)
Net payables (a)	(3		)	—		—
Total	$	642		$	140	$	(6	)

(a) Net payables relate to pending securities sales and purchases.

Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds

The following table sets forth approximate realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds (dollars in millions):

	Three Months Ended March 31,
	2014			2013
Realized gains	$	1		$	2
Realized losses	(2		)	(1		)
Proceeds from the sale of securities (a)	103			135

(a) Proceeds are reinvested in the trust.

Fair value of fixed income securities, summarized by contractual maturities

The fair value of fixed income securities, summarized by contractual maturities, at March 31, 2014 is as follows (dollars in millions):

	Fair Value
Less than one year	$	17
1 year — 5 years	109
5 years — 10 years	111
Greater than 10 years	149
Total	$	386