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Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2016

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,
			2016								2015
			Current				Noncurrent				Current				Noncurrent
Regulatory assets:
Price risk management ⁽²⁾	6 years		$	26			$	120			$	120			$	161
Pension and other postretirement plans ⁽²⁾	⁽³⁾		—				235				—				239
Deferred income taxes ⁽²⁾	⁽⁴⁾		—				86				—				86
Debt issuance costs ⁽²⁾	6 years		—				22				—				16
Other ⁽⁵⁾	Various		10				35				9				22
Total regulatory assets			$	36			$	498			$	129			$	524
Regulatory liabilities:
Asset retirement removal costs ⁽⁶⁾	⁽⁴⁾		$	—			$	887			$	—			$	837
Trojan decommissioning activities	3 years		18				—				17				15
Asset retirement obligations ⁽⁶⁾	⁽⁴⁾		—				49				—				45
Other	Various		33				22				38				31
Total regulatory liabilities			$	51		⁽⁷⁾	$	958			$	55		⁽⁷⁾	$	928


(1)	As of December 31, 2016.


(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 $44 million and $29 million as of December 31, 2016 and 2015, respectively.


(6)	Included in rate base for ratemaking purposes.


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