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Regulatory Assets and Liabilities
3 Months Ended
Mar. 31, 2017
Regulatory Assets and Liabilities Disclosure [Abstract]  
Regulatory Assets and Liabilities
Regulatory Assets and Liabilities
Regulatory Assets
SCE's regulatory assets included on the consolidated balance sheets are:
(in millions)
March 31,
2017
 
December 31,
2016
Current:
 
 
 
Regulatory balancing accounts
$
139

 
$
135

Energy derivatives
186

 
150

Unamortized investments, net of accumulated amortization
37

 
49

Other
32

 
16

Total current
394

 
350

Long-term:
 
 
 
Deferred income taxes, net of liabilities
4,689

 
4,478

Pensions and other postretirement benefits
711

 
710

Energy derivatives
996

 
947

Unamortized investments, net of accumulated amortization
79

 
80

San Onofre
815

 
857

Unamortized loss on reacquired debt
180

 
184

Regulatory balancing accounts
68

 
66

Environmental remediation
125

 
126

Other
11

 
7

Total long-term
7,674

 
7,455

Total regulatory assets
$
8,068

 
$
7,805


Regulatory Liabilities
SCE's regulatory liabilities included on the consolidated balance sheets are:
(in millions)
March 31,
2017
 
December 31,
2016
Current:
 
 
 
Regulatory balancing accounts
$
740

 
$
736

San Onofre MHI arbitration award1
47

 

Other
17

 
20

Total current
804

 
756

Long-term:
 
 
 
Costs of removal
2,838

 
2,847

Recoveries in excess of ARO liabilities2
1,735

 
1,639

Regulatory balancing accounts
1,278

 
1,180

Other
59

 
60

Total long-term
5,910

 
5,726

Total regulatory liabilities
$
6,714

 
$
6,482


1
Represents SCE's net recovery from claims against MHI. See Note 11 for further discussion.
2
Represents the cumulative differences between ARO expenses and amounts collected in rates primarily for the decommissioning of SCE's nuclear generation facilities. Decommissioning costs recovered through rates are primarily placed in nuclear decommissioning trusts. This regulatory liability also represents the deferral of realized and unrealized gains and losses on the nuclear decommissioning trust investments. See Note 9 for further discussion.
Net Regulatory Balancing Accounts
The following table summarizes the significant components of regulatory balancing accounts included in the above tables of regulatory assets and liabilities:
(in millions)
March 31,
2017
 
December 31,
2016
Asset (liability)
 
 
 
Energy resource recovery account
$
30

 
$
(20
)
New system generation balancing account
(97
)
 
(6
)
Public purpose programs and energy efficiency programs
(1,056
)
 
(992
)
Tax accounting memorandum account and pole loading balancing account
(136
)
 
(142
)
Base rate recovery balancing account
(360
)
 
(426
)
Department of Energy litigation memorandum account

(123
)
 
(122
)
Greenhouse gas auction revenue
(3
)
 
31

FERC balancing accounts
(93
)
 
(69
)
Other
27

 
31

Liability
$
(1,811
)
 
$
(1,715
)