Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	$ 679		$ 719
Total Fair Value, Liabilities	765		794
Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	420	[1]	536	[1]
Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	407		523
Current Assets | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	13		13
Noncurrent Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	259	[2]	183	[2]
Noncurrent Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	254		172
Noncurrent Assets | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	5		11
Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	600		591
Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	371		491
Current Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	229		100
Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	165	[3]	203	[3]
Noncurrent Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	87		101
Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	78		102
Fair Value – Derivatives under Hedge Accounting
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	456		376
Total Fair Value, Liabilities	608		481
Fair Value – Derivatives under Hedge Accounting | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	311	[1]	294	[1]
Fair Value – Derivatives under Hedge Accounting | Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	298		281
Fair Value – Derivatives under Hedge Accounting | Current Assets | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	13		13
Fair Value – Derivatives under Hedge Accounting | Noncurrent Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	145	[2]	82	[2]
Fair Value – Derivatives under Hedge Accounting | Noncurrent Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	140		71
Fair Value – Derivatives under Hedge Accounting | Noncurrent Assets | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	5		11
Fair Value – Derivatives under Hedge Accounting | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	482		324
Fair Value – Derivatives under Hedge Accounting | Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	253		224
Fair Value – Derivatives under Hedge Accounting | Current Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	229		100
Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	126	[3]	157	[3]
Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	48		55
Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	78		102
Fair Value – Derivatives not under Hedge Accounting
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	223		343
Total Fair Value, Liabilities	157		313
Fair Value – Derivatives not under Hedge Accounting | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	109	[1]	242	[1]
Fair Value – Derivatives not under Hedge Accounting | Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	109		242
Fair Value – Derivatives not under Hedge Accounting | Current Assets | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	0		0
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	114	[2]	101	[2]
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	114		101
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Assets | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	0		0
Fair Value – Derivatives not under Hedge Accounting | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	118		267
Fair Value – Derivatives not under Hedge Accounting | Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	118		267
Fair Value – Derivatives not under Hedge Accounting | Current Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	0		0
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	39	[3]	46	[3]
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	39		46
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	0		0
Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	106		113
Total Fair Value, Liabilities	139		87
Virginia Electric and Power Company | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	28	[4]	51	[4]
Virginia Electric and Power Company | Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	28		51
Virginia Electric and Power Company | Noncurrent Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	78	[5]	62	[5]
Virginia Electric and Power Company | Noncurrent Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	78		62
Virginia Electric and Power Company | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	107	[6]	60	[6]
Virginia Electric and Power Company | Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	11		15
Virginia Electric and Power Company | Current Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	96		45
Virginia Electric and Power Company | Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	32	[7]	27	[7]
Virginia Electric and Power Company | Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	32		27
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	0		0
Total Fair Value, Liabilities	129		75
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	0	[4]	0	[4]
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	0		0
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Noncurrent Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	0	[5]	0	[5]
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Noncurrent Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	0		0
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	97	[6]	48	[6]
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	1		3
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Current Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	96		45
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	32	[7]	27	[7]
Virginia Electric and Power Company | Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	32		27
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	106		113
Total Fair Value, Liabilities	10		12
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	28	[4]	51	[4]
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	28		51
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Noncurrent Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	78	[5]	62	[5]
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	78		62
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	10	[6]	12	[6]
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	10		12
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Current Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	0		0
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	0	[7]	0	[7]
Virginia Electric and Power Company | Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	0		0
Dominion Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	3		2
Total Fair Value, Liabilities	16		9
Dominion Gas Holdings, LLC | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	3	[8]	2	[8]
Dominion Gas Holdings, LLC | Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	3		2
Dominion Gas Holdings, LLC | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	3	[9]	9	[9]
Dominion Gas Holdings, LLC | Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	3		9
Dominion Gas Holdings, LLC | Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	13	[10]
Dominion Gas Holdings, LLC | Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	13
Dominion Gas Holdings, LLC | Fair Value – Derivatives under Hedge Accounting
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	2		2
Total Fair Value, Liabilities	16		9
Dominion Gas Holdings, LLC | Fair Value – Derivatives under Hedge Accounting | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	2	[8]	2	[8]
Dominion Gas Holdings, LLC | Fair Value – Derivatives under Hedge Accounting | Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	2		2
Dominion Gas Holdings, LLC | Fair Value – Derivatives under Hedge Accounting | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	3	[9]	9	[9]
Dominion Gas Holdings, LLC | Fair Value – Derivatives under Hedge Accounting | Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	3		9
Dominion Gas Holdings, LLC | Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	13	[10]
Dominion Gas Holdings, LLC | Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	13
Dominion Gas Holdings, LLC | Fair Value – Derivatives not under Hedge Accounting
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	1		0
Total Fair Value, Liabilities	0		0
Dominion Gas Holdings, LLC | Fair Value – Derivatives not under Hedge Accounting | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	1	[8]	0	[8]
Dominion Gas Holdings, LLC | Fair Value – Derivatives not under Hedge Accounting | Current Assets | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Assets	1		0
Dominion Gas Holdings, LLC | Fair Value – Derivatives not under Hedge Accounting | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	0	[9]	0	[9]
Dominion Gas Holdings, LLC | Fair Value – Derivatives not under Hedge Accounting | Current Liabilities | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	0		0
Dominion Gas Holdings, LLC | Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	0	[10]
Dominion Gas Holdings, LLC | Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total Fair Value, Liabilities	$ 0

[1] Current derivative assets are presented in other current assets in Dominion's Consolidated Balance Sheets.

[2] Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion’s Consolidated Balance Sheets.

[3] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion’s Consolidated Balance Sheets.

[4] Current derivative assets are presented in other current assets in Virginia Power's Consolidated Balance Sheets.

[5] Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power's Consolidated Balance Sheets.

[6] Current derivative liabilities are presented in other current liabilities in Virginia Power's Consolidated Balance Sheets.

[7] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.

[8] Current derivative assets are presented in other current assets in Dominion Gas' Consolidated Balance Sheets.

[9] Current derivative liabilities are presented in other current liabilities in Dominion Gas' Consolidated Balance Sheets.

[10] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Gas’ Consolidated Balance Sheets.