Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets Included on the Consolidated Balance Sheets

SCE's regulatory assets included on the consolidated balance sheets are:

	December 31,
(in millions)	2017		2016
Current:
Regulatory balancing accounts	$	484	$	135
Power contracts and energy derivatives	203		150
Unamortized investments, net of accumulated amortization	5		49
Other	11		16
Total current	703		350
Long-term:
Deferred income taxes, net of liabilities	3,143		4,478
Pensions and other postretirement benefits	271		710
Power contracts and energy derivatives	799		947
Unamortized investments, net of accumulated amortization	123		80
San Onofre	72		857
Unamortized loss on reacquired debt	168		184
Regulatory balancing accounts	143		66
Environmental remediation	144		126
Other	51		7
Total long-term	4,914		7,455
Total regulatory assets	$	5,617	$	7,805

Regulatory Liabilities Included on the Consolidated Balance Sheets

SCE's regulatory liabilities included on the consolidated balance sheets are:

	December 31,
(in millions)	2017		2016
Current:
Regulatory balancing accounts	$	1,009	$	736
Energy derivatives	74		—
Other	38		20
Total current	1,121		756
Long-term:
Costs of removal	2,741		2,847
Re-measurement of deferred taxes	2,892		—
Recoveries in excess of ARO liabilities	1,575		1,639
Regulatory balancing accounts	1,316		1,180
Other postretirement benefits	26		—
Other	64		60
Total long-term	8,614		5,726
Total regulatory liabilities	$	9,735	$	6,482

Schedule of Regulatory Balancing Accounts

The following table summarizes the significant components of regulatory balancing accounts included in the above tables of regulatory assets and liabilities:

	December 31,
(in millions)	2017			2016
Asset (liability)
Energy resource recovery account	$	464		$	(20	)
New system generation balancing account	(197		)	(6		)
Public purpose programs and energy efficiency programs	(1,145		)	(992		)
Base revenue requirement balancing account	(200		)	(426		)
Tax accounting memorandum account and pole loading balancing account	(259		)	(142		)
DOE litigation memorandum account	(156		)	(122		)
Greenhouse gas auction revenue	(22		)	31
FERC balancing accounts	(205		)	(69		)
Other	22			31
Liability	$	(1,698	)	$	(1,715	)