Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Total Fair Value, Assets	$ 849		$ 1,070
Total Fair Value, Liabilities	653		1,157
Current Assets
Total Fair Value, Assets	514		705
Current Assets | Commodity Contract
Total Fair Value, Assets	476		671
Current Assets | Interest Rate Contract
Total Fair Value, Assets	38		34
Noncurrent Assets
Total Fair Value, Assets	335	[1]	365	[1]
Noncurrent Assets | Commodity Contract
Total Fair Value, Assets	280		294
Noncurrent Assets | Interest Rate Contract
Total Fair Value, Assets	55		71
Current Liabilities
Total Fair Value, Liabilities	499		951
Current Liabilities | Commodity Contract
Total Fair Value, Liabilities	371		692
Current Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	128		259
Noncurrent Liabilities
Total Fair Value, Liabilities	154	[2]	206	[2]
Noncurrent Liabilities | Commodity Contract
Total Fair Value, Liabilities	144		196
Noncurrent Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	10		10
Fair Value - Derivatives under Hedge Accounting
Total Fair Value, Assets	417		479
Total Fair Value, Liabilities	248		502
Fair Value - Derivatives under Hedge Accounting | Current Assets
Total Fair Value, Assets	186		210
Fair Value - Derivatives under Hedge Accounting | Current Assets | Commodity Contract
Total Fair Value, Assets	148		176
Fair Value - Derivatives under Hedge Accounting | Current Assets | Interest Rate Contract
Total Fair Value, Assets	38		34
Fair Value - Derivatives under Hedge Accounting | Noncurrent Assets
Total Fair Value, Assets	231	[1]	269	[1]
Fair Value - Derivatives under Hedge Accounting | Noncurrent Assets | Commodity Contract
Total Fair Value, Assets	176		198
Fair Value - Derivatives under Hedge Accounting | Noncurrent Assets | Interest Rate Contract
Total Fair Value, Assets	55		71
Fair Value - Derivatives under Hedge Accounting | Current Liabilities
Total Fair Value, Liabilities	180		384
Fair Value - Derivatives under Hedge Accounting | Current Liabilities | Commodity Contract
Total Fair Value, Liabilities	81		162
Fair Value - Derivatives under Hedge Accounting | Current Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	99		222
Fair Value - Derivatives under Hedge Accounting | Noncurrent Liabilities
Total Fair Value, Liabilities	68	[2]	118	[2]
Fair Value - Derivatives under Hedge Accounting | Noncurrent Liabilities | Commodity Contract
Total Fair Value, Liabilities	65		118
Fair Value - Derivatives under Hedge Accounting | Noncurrent Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	3		0
Fair Value - Derivatives not under Hedge Accounting
Total Fair Value, Assets	432		591
Total Fair Value, Liabilities	405		655
Fair Value - Derivatives not under Hedge Accounting | Current Assets
Total Fair Value, Assets	328		495
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity Contract
Total Fair Value, Assets	328		495
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Interest Rate Contract
Total Fair Value, Assets	0		0
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets
Total Fair Value, Assets	104	[1]	96	[1]
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity Contract
Total Fair Value, Assets	104		96
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Interest Rate Contract
Total Fair Value, Assets	0		0
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities
Total Fair Value, Liabilities	319		567
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity Contract
Total Fair Value, Liabilities	290		530
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	29		37
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities
Total Fair Value, Liabilities	86	[2]	88	[2]
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity Contract
Total Fair Value, Liabilities	79		78
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	7		10
Virginia Electric and Power Company
Total Fair Value, Assets	0		2
Total Fair Value, Liabilities	0		147
Virginia Electric and Power Company | Current Assets
Total Fair Value, Assets	0	[3]	2	[3]
Virginia Electric and Power Company | Current Assets | Commodity Contract
Total Fair Value, Assets	0		2
Virginia Electric and Power Company | Current Liabilities
Total Fair Value, Liabilities	0	[4]	135
Virginia Electric and Power Company | Current Liabilities | Commodity Contract
Total Fair Value, Liabilities	0		45
Virginia Electric and Power Company | Current Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	0		90
Virginia Electric and Power Company | Noncurrent Liabilities
Total Fair Value, Liabilities	0	[5]	12	[4]
Virginia Electric and Power Company | Noncurrent Liabilities | Commodity Contract
Total Fair Value, Liabilities	0		2
Virginia Electric and Power Company | Noncurrent Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	0		10
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting
Total Fair Value, Assets	0		0
Total Fair Value, Liabilities	0		69
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting | Current Assets
Total Fair Value, Assets	0	[3]	0	[3]
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting | Current Assets | Commodity Contract
Total Fair Value, Assets	0		0
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting | Current Liabilities
Total Fair Value, Liabilities	0	[4]	67
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting | Current Liabilities | Commodity Contract
Total Fair Value, Liabilities	0		14
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting | Current Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	0		53
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting | Noncurrent Liabilities
Total Fair Value, Liabilities	0	[5]	2	[4]
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting | Noncurrent Liabilities | Commodity Contract
Total Fair Value, Liabilities	0		2
Virginia Electric and Power Company | Fair Value - Derivatives under Hedge Accounting | Noncurrent Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	0		0
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting
Total Fair Value, Assets	0		2
Total Fair Value, Liabilities	0		78
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting | Current Assets
Total Fair Value, Assets	0	[3]	2	[3]
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity Contract
Total Fair Value, Assets	0		2
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting | Current Liabilities
Total Fair Value, Liabilities	0	[4]	68
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity Contract
Total Fair Value, Liabilities	0		31
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	0		37
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities
Total Fair Value, Liabilities	0	[5]	10	[4]
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity Contract
Total Fair Value, Liabilities	0		0
Virginia Electric and Power Company | Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities | Interest Rate Contract
Total Fair Value, Liabilities	$ 0		$ 10

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

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

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

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

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