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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
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:
Year Ended December 31,
2014
2013
(millions)
 
 
Dominion
$42
$38
Virginia Power
20
21
Dominion Gas
9
7
Schedule of Depreciation Rates
The Companies' average composite depreciation rates on utility property, plant and equipment are as follows:
Year Ended December 31,
2014
2013
2012
(percent)
 
 
 
Dominion
 
 
 
Generation
2.66
2.71
2.62
Transmission
2.38
2.36
2.17
Distribution
3.12
3.13
3.17
Storage
2.39
2.43
2.59
Gas gathering and processing
2.81
2.39
2.49
General and other
3.62
3.82
4.55
Virginia Power
 
 
 
Generation
2.66
2.71
2.62
Transmission
2.34
2.28
1.98
Distribution
3.34
3.33
3.32
General and other
3.29
3.51
4.32
Dominion Gas
 
 
 
Transmission
2.40
2.43
2.35
Distribution
2.47
2.50
2.66
Storage
2.40
2.43
2.58
Gas gathering and processing
2.82
2.39
2.50
General and other
5.77
5.93
6.09
Schedule of Estimated Useful Life
Dominion'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
15-36 years
General and other
5-59 years