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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Summary of Revenues Disaggregated by Type of Customer
The following table presents the Utility’s revenues disaggregated by type of customer:
(in millions)
Year Ended December 31, 2018
Electric
 
Revenue from contracts with customers
 
   Residential
$
5,051

   Commercial
4,908

   Industrial
1,532

   Agricultural
1,234

   Public street and highway lighting
72

   Other (1)
(720
)
      Total revenue from contracts with customers - electric
12,077

Regulatory balancing accounts (2)
636

Total electric operating revenue
$
12,713

 
 
Natural gas
 
Revenue from contracts with customers
 
   Residential
$
2,042

   Commercial
537

   Transportation service only
1,151

   Other (1)
75

      Total revenue from contracts with customers - gas
3,805

Regulatory balancing accounts (2)
242

Total natural gas operating revenue
4,047

Total operating revenues
$
16,760

 
 
(1) This activity is primarily related to the change in unbilled revenue and amounts subject to refund, partially offset by other miscellaneous revenue items.
(2) These amounts represent revenues authorized to be billed or refunded to customers.
Schedule of Estimated Useful Lives and Balances of Utility's Property, Plant and Equipment
The Utility’s total estimated useful lives and balances of its property, plant, and equipment were as follows:
 
Estimated Useful
 
Balance at December 31,
(in millions, except estimated useful lives)
Lives (years)
 
2018
 
2017
Electricity generating facilities (1)
5 to 120
 
$
13,047

 
$
11,843

Electricity distribution facilities
15 to 65
 
32,926

 
31,110

Electricity transmission facilities
15 to 75
 
13,177

 
12,180

Natural gas distribution facilities
20 to 60
 
13,296

 
12,312

Natural gas transmission and storage facilities
5 to 62
 
8,260

 
7,329

Construction work in progress
 
 
2,564

 
2,471

Total property, plant, and equipment
 
 
83,270

 
77,245

Accumulated depreciation
 
 
(24,713
)
 
(23,456
)
Net property, plant, and equipment
 
 
$
58,557

 
$
53,789

 
 
 
 
 
 
(1) Balance includes nuclear fuel inventories.  Stored nuclear fuel inventory is stated at weighted-average cost.  Nuclear fuel in the reactor is expensed as it is used based on the amount of energy output.  (See Note 14 below.)
Schedule of Changes in Asset Retirement Obligations
The following table summarizes the changes in ARO liability during 2018 and 2017, including nuclear decommissioning obligations:
(in millions)
2018
 
2017
ARO liability at beginning of year
$
4,899

 
$
4,684

Revision in estimated cash flows
993

 
128

Accretion
211

 
207

Liabilities settled
(109
)
 
(120
)
ARO liability at end of year
$
5,994

 
$
4,899
Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income
The changes, net of income tax, in PG&E Corporation’s accumulated other comprehensive income (loss) for the year ended December 31, 2018 consisted of the following:
(in millions, net of income tax)
Pension
Benefits
 
Other
Benefits
 
Total
Beginning balance
$
(25
)
 
$
17

 
$
(8
)
Other comprehensive income before reclassifications:
 
 
 
 
 
Unrecognized net actuarial loss (net of taxes of $41 and $9, respectively)
(104
)
 
(23
)
 
(127
)
Regulatory account transfer (net of taxes of $41 and $9, respectively)
107

 
23

 
130

Amounts reclassified from other comprehensive income:
 
 
 
 
 
Amortization of prior service cost (net of taxes of $2 and $4, respectively) (1)
(4
)
 
10

 
6

Amortization of net actuarial loss (net of taxes of $2 and $1, respectively) (1)
3

 
(4
)
 
(1
)
Regulatory account transfer (net of taxes of $1 and $3, respectively) (1)
2

 
(6
)
 
(4
)
Net current period other comprehensive loss
4

 
—

 
4

Ending balance
$
(21
)
 
$
17

 
$
(4
)
 
 
 
 
 
 
(1) These components are included in the computation of net periodic pension and other postretirement benefit costs.  (See Note 11 below for additional details.) 

The changes, net of income tax, in PG&E Corporation’s accumulated other comprehensive income (loss) for the year ended December 31, 2017 consisted of the following:
(in millions, net of income tax)
Pension
Benefits
 
Other
Benefits
 
Total
Beginning balance
$
(25
)
 
$
16

 
$
(9
)
Other comprehensive income before reclassifications:
 
 
 
 
 
Unrecognized prior service cost (net of taxes of $4 and $0, respectively)
(6
)
 
—

 
(6
)
Unrecognized net actuarial loss (net of taxes of $229 and $97, respectively)
333

 
141

 
474

Regulatory account transfer (net of taxes of $225 and $97, respectively)
(327
)
 
(141
)
 
(468
)
Amounts reclassified from other comprehensive income:


 


 
 
Amortization of prior service cost (net of taxes of $3 and $6, respectively) (1)
(4
)
 
9

 
5

Amortization of net actuarial loss (net of taxes of $9 and $2, respectively) (1)
13

 
2

 
15

Regulatory account transfer (net of taxes of $6 and $8, respectively) (1)
(9
)
 
(10
)
 
(19
)
Net current period other comprehensive loss
—

 
1

 
1

Ending balance
$
(25
)
 
$
17

 
$
(8
)
 
 
 
 
 
 
(1) These components are included in the computation of net periodic pension and other postretirement benefit costs.  (See Note 11 below for additional details.)