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Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Regulatory Assets [Line Items]

Schedule of Regulatory Assets and Liabilities [Table Text Block]

Regulatory assets and liabilities consist of the following (dollars in millions):



	Weighted Average Remaining Life ⁽¹⁾		As of December 31,
			2015								2014
			Current				Noncurrent				Current				Noncurrent
Regulatory assets:
Price risk management ⁽²⁾	4 years		$	120			$	161			$	100			$	121
Pension and other postretirement plans ⁽²⁾	⁽³⁾		—				239				—				247
Deferred income taxes ⁽²⁾	⁽⁴⁾		—				86				—				86
Debt issuance costs ⁽²⁾	8 years		—				16				—				15
Deferred capital projects	1 year		—				—				19				—
Other ⁽⁵⁾	Various		9				22				14				25
Total regulatory assets			$	129			$	524			$	133			$	494
Regulatory liabilities:
Asset retirement removal costs ⁽⁶⁾	⁽⁴⁾		$	—			$	837			$	—			$	804
Trojan decommissioning activities	3 years		17				15				23				34
Asset retirement obligations ⁽⁶⁾	⁽⁴⁾		—				45				—				39
Other	Various		38				31				37				29
Total regulatory liabilities			$	55		⁽⁷⁾	$	928			$	60		⁽⁷⁾	$	906


(1)	As of December 31, 2015.


(2)	Does not include a return on investment.


(3)	Recovery expected over the average service life of employees.


(4)	Recovery expected over the estimated lives of the assets.


(5)	Of the total other unamortized regulatory asset balances, a return is recorded on $29 million and $33 million as of December 31, 2015 and 2014, respectively.


(6)	Included in rate base for ratemaking purposes.


(7)	Included in Accrued expenses and other current liabilities on the consolidated balance sheets.