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Significant Accounting Policies (Tables)
Nov. 18, 2019
Accounting Policies [Abstract]  
Schedule of Checks Outstanding but Not Yet Presented for Payment The following table illustrates the checks outstanding but not yet presented for payment and recorded in accounts payable for the Companies:
At December 31,
 
                2018                
 
  
                2017                
  
(millions)
 
   
 
Dominion Energy
 
$
35
 
   $
30
 
Virginia Power
 
 
16
 
    
17
 
Dominion Energy Gas
 
 
7
 
    
6
 
Reconciliation of Total Cash, Restricted Cash and Equivalents
The following table provides a reconciliation of the total cash, restricted cash and equivalents reported within the Companies’ Consolidated Balance Sheets to the corresponding amounts reported within the Companies’ Consolidated Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016:
  
Cash, Restricted Cash and Equivalents at End/Beginning of Year
 
                                                                                                                                
  
  December 31,  
2018
 
  
   December 31,   
2017
   
  December 31,  
2016
   
  December 31,  
2015
 
                                 
(millions)
 
   
   
   
 
                                 
Dominion Energy
 
 
 
  
 
 
  
 
 
  
 
 
                                 
Cash and cash equivalents
 
$
268
 
   $
120
    $
261
    $
607
 
                                 
Restricted cash and equivalents
(1)
  
 
123
 
    
65
     
61
     
25
 
                                 
Cash, restricted cash and equivalents shown in the
Consolidated Statements of Cash Flows
 
$
391
 
   $
185
    $
322
    $
632
 
                                 
                                 
Virginia Power
 
 
 
  
 
 
  
 
 
  
 
 
                                 
Cash and cash equivalents
 
$
29
 
   $
14
    $
11
    $
18
 
                                 
Restricted cash and equivalents
(1)
  
 
9
 
    
10
     
— 
      
— 
  
                                 
Cash, restricted cash and equivalents shown in the
Consolidated Statements of Cash Flows
 
$
38
 
   $
24
    $
11
    $
18
 
                                 
                                 
Dominion Energy Gas
 
 
 
  
 
 
  
 
 
  
 
 
                                 
Cash and cash equivalents
(
2
)
  
$
108
 
   $
18
    $
76
    $
57
 
                                 
Restricted cash and equivalents
(1)
  
 
90
 
    
39
     
45
     
14
 
                                 
Cash, restricted cash and equivalents shown in the
Consolidated Statements of Cash Flows
 
$
198
 
   $
57
    $
121
    $
71
 
                                 
(1)
Restricted cash and equivalent balances are presented within other current assets in the Companies’ Consolidated Balance Sheets.
(2)
At December 31, 2015, 2016, 2017 and 2018, Dominion Energy Gas had $5 million, $14 million, $3 million and $9 million of cash and cash equivalents included in current assets of discontinued operations, respectively.
Schedule of Depreciation Rates The Companies’ average composite depreciation rates on utility property, plant and equipment are as follows:
                         
Year Ended December 31,
 
                    2018                    
 
  
            2017            
    
            2016            
  
(percent)
 
   
   
 
Dominion Energy
 
 
 
  
 
 
  
 
 
Generation
 
 
2.71
 
    
2.94
     
2.83
 
Transmission
 
 
2.54
 
    
2.55
     
2.47
 
Distribution
 
 
2.97
 
    
3.00
     
3.02
 
Storage
 
 
2.40
 
    
2.48
     
2.29
 
Gas gathering and processing
 
 
2.62
 
    
2.21
     
2.66
 
General and other
 
 
4.56
 
    
4.89
     
4.12
 
Virginia Power
 
 
 
  
 
 
  
 
 
Generation
 
 
2.71
 
    
2.94
     
2.83
 
Transmission
 
 
2.52
 
    
2.54
     
2.36
 
Distribution
 
 
3.31
 
    
3.32
     
3.32
 
General and other
 
 
4.52
 
    
4.68
     
3.49
 
Dominion Energy Gas
 
 
 
  
 
 
  
 
 
Transmission
 
 
2.66
 
    
2.67
     
2.68
 
Distribution
 
 
2.41
 
    
2.56
     
2.42
 
Storage
 
 
2.42
 
    
2.51
     
2.26
 
Gas gathering and processing
 
 
3.19
 
    
2.00
     
2.56
 
General and other
 
 
3.90
 
    
5.00
     
6.37
 
 
 
 
 
 
 
 
 
 
Property, Plant and Equipment
Dominion Energy’s nonutility property, plant and equipment is depreciated using the straight-line method over the following estimated useful lives
:
         
Asset
  
Estimated Useful Lives                        
  
   
Merchant generation-nuclear
 
 
44 years
 
Merchant generation-other
 
 
15-30
 years
 
Nonutility gas gathering and processing
 
 
3-50
years
 
LNG facility
 
 
40 years
 
General and other
 
 
5-59
years