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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Tables)
12 Months Ended
Dec. 31, 2019
Regulated Operations [Abstract]  
Long-Term Regulatory Assets
Long-term regulatory assets are comprised of the following:
 Balance at December 31,Recovery
Period
(in millions)20192018
Pension benefits (1)
$1,823  $1,947  Indefinitely
Environmental compliance costs1,062  1,013  32 years
Utility retained generation (2)
228  274  8 years
Price risk management124  90  10 years
Unamortized loss, net of gain, on reacquired debt
63  76  25 years
Catastrophic event memorandum account (3)
656  790  
1 - 4 years
Wildfire expense memorandum account (4)
423  94  
1 - 4 years
Fire hazard prevention memorandum account (5)
259  263  
1 - 4 years
Fire risk mitigation memorandum account (6)
95  —  
1 - 4 years
Wildfire mitigation plan memorandum account (7)
558  —  
1 - 4 years
Deferred income taxes (8)
252  —  47 years
Other (9)
523  417  Various
Total long-term regulatory assets$6,066  $4,964   
(1) Payments into the pension and other benefits plans are based on annual contribution requirements. As these annual requirements continue indefinitely into the future, the Utility expects to continuously recover pension benefits.
(2) In connection with the settlement agreement entered into among PG&E Corporation, the Utility, and the CPUC in 2003 to resolve the Utility’s 2001 proceeding under Chapter 11, the CPUC authorized the Utility to recover $1.2 billion of costs related to the Utility’s retained generation assets.  The individual components of these regulatory assets are being amortized over the respective lives of the underlying generation facilities, consistent with the period over which the related revenues are recognized. 
(3) Includes costs of responding to catastrophic events that have been declared a disaster or state of emergency by competent federal or state authorities. Recovery of CEMA costs are subject to CPUC review and approval.
(4) Includes specific incremental wildfire-related liability costs the CPUC approved for tracking in June 2018. Recovery of WEMA costs are subject to CPUC review and approval.
(5) Includes costs associated with the implementation of regulations and requirements adopted to protect the public from potential fire hazards associated with overhead power line facilities and nearby aerial communication facilities that have not been previously authorized in another proceeding. Recovery of FHPMA costs are subject to CPUC review and approval.
(6) Includes costs associated with the 2019 Wildfire Mitigation Plan for the period January 1, 2019 through June 4, 2019. Recovery of FRMMA costs are subject to CPUC review and approval.
(7) Includes costs associated with the 2019 Wildfire Mitigation Plan for the period June 5, 2019 through December 31, 2019. Recovery of WMPMA costs are subject to CPUC review and approval.
(8) Represents cumulative differences between amounts recognized for ratemaking purposes and expense recognized in accordance with GAAP. (See Note 9 below.)
(9) December 31, 2019 balance includes $178 million of unamortized debt issuance costs and debt discount that was written off to present the debt subject to compromise at the outstanding face value.
Long-Term Regulatory Liabilities
Long-term regulatory liabilities are comprised of the following:
 Balance at December 31,
(in millions)20192018
Cost of removal obligations (1)
$6,456  $5,981  
Deferred income taxes (2)
—  283  
Recoveries in excess of AROs (3)
393  356  
Public purpose programs (4)
817  674  
Retirement plans (5)
750  421  
Other854  824  
Total long-term regulatory liabilities
$9,270  $8,539  
(1) Represents the cumulative differences between asset removal costs recorded and amounts collected in rates for expected asset removal costs.
(2) Represents the cumulative differences between amounts recognized for ratemaking purposes and expense recognized in accordance with GAAP. (See Note 9 below.)
(3) Represents the cumulative differences between ARO expenses and amounts collected in rates.  Decommissioning costs related to the Utility’s nuclear facilities are recovered through rates and are placed in nuclear decommissioning trusts.  This regulatory liability also represents the deferral of realized and unrealized gains and losses on these nuclear decommissioning trust investments.  (See Note 11 below.)
(4) Represents amounts received from customers designated for public purpose program costs expected to be incurred beyond the next 12 months, primarily related to energy efficiency programs.
(5) Represents cumulative differences between incurred costs and amounts collected in rates for Post-Retirement Medical, Post-Retirement Life and Long-Term Disability Plans.
Current Regulatory Balancing Accounts Receivable
Current regulatory balancing accounts receivable and payable are comprised of the following:
Receivable
Balance at December 31,
(in millions)20192018
Electric distribution$—  $160  
Electric transmission 128  
Utility generation—  79  
Gas distribution and transmission363  462  
Energy procurement901  168  
Public purpose programs209  111  
Other632  327  
Total regulatory balancing accounts receivable$2,114  $1,435  
Current Regulatory Balancing Accounts Payable
Payable
Balance at December 31,
(in millions)20192018
Electric distribution$31  $—  
Electric transmission119  134  
Gas distribution and transmission45   
Energy procurement649  59  
Public purpose programs559  587  
Other394  287  
Total regulatory balancing accounts payable$1,797  $1,076