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Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

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,
			2017								2016
			Current				Noncurrent				Current				Noncurrent
Regulatory assets:
Price risk management ⁽²⁾	6 years		$	53			$	151			$	26			$	120
Pension and other postretirement plans ⁽²⁾	⁽³⁾		—				218				—				235
Deferred income taxes ⁽⁶⁾	⁽⁴⁾		—				—				—				86
Debt issuance costs ⁽²⁾	6 years		—				19				—				22
Other ⁽⁵⁾	Various		9				50				10				35
Total regulatory assets			$	62			$	438			$	36			$	498
Regulatory liabilities:
Asset retirement removal costs ⁽⁶⁾	⁽⁴⁾		$	—			$	933			$	—			$	887
Deferred income taxes ⁽⁶⁾	⁽⁴⁾		—				277				—				—
Trojan decommissioning activities	5 years		3				—				18				—
Asset retirement obligations ⁽⁶⁾	⁽⁴⁾		—				52				—				49
Other	Various		28				26				33				22
Total regulatory liabilities			$	31		⁽⁷⁾	$	1,288			$	51		⁽⁷⁾	$	958


(1)	As of December 31, 2017.


(2)	Does not include a return on investment.


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


(4)	Recovery or refund expected over the estimated lives of the net balance.


(5)	Of the total other unamortized regulatory asset balances, a return is recorded on $51 million and $44 million as of December 31, 2017 and 2016, respectively.


(6)	Included in rate base for ratemaking purposes.


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