Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2014

The following is the activity in the allowance for uncollectible accounts (in millions):



	Years Ended December 31,
	2014			2013			2012
Balance as of beginning of year	$	6		$	5		$	6
Increase in provision	6			6			6
Amounts written off, less recoveries	(6		)	(5		)	(7		)
Balance as of end of year	$	6		$	6		$	5

The trusts are comprised of the following investments as of December 31 (in millions):



	Nuclear Decommissioning Trust				Non-Qualified Benefit Plan Trust
	2014		2013		2014		2013
Cash equivalents	$	65	$	59	$	—	$	—
Marketable securities, at fair value:
Equity securities	—		—		6		8
Debt securities	25		23		—		1
Insurance contracts, at cash surrender value	—		—		26		26
	$	90	$	82	$	32	$	35

Other current assets and Accrued expenses and other current liabilities consist of the following (in millions):



	As of December 31,
	2014		2013
Other current assets:
Prepaid expenses	$	39	$	38
Current deferred income tax asset	33		42
Accrued sales tax refund related to Tucannon River Wind Farm	23		—
Margin deposits	11		9
Assets from price risk management activities	6		13
Other	3		1
	$	115	$	103
Accrued expenses and other current liabilities:
Regulatory liabilities—current	$	60	$	1
Accrued employee compensation and benefits	51		46
Accrued interest payable	26		23
Dividends payable	23		22
Accrued taxes payable	22		21
Other	54		58
	$	236	$	171