Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Total Fair Value, Assets	$ 751		$ 828
Total Fair Value, Liabilities	644		661
Derivative assets held for sale	527		518	[1]
Current Assets
Total Fair Value, Assets	534	[2]	518
Derivative assets held for sale	534
Current Assets | Commodity
Total Fair Value, Assets	500		482
Current Assets | Interest rate
Total Fair Value, Assets	34		36
Noncurrent Assets
Total Fair Value, Assets	217	[3]	310	[3]
Noncurrent Assets | Commodity
Total Fair Value, Assets	173		253
Noncurrent Assets | Interest rate
Total Fair Value, Assets	44		57
Current Liabilities
Total Fair Value, Liabilities	556		510
Current Liabilities | Commodity
Total Fair Value, Liabilities	523		444
Current Liabilities | Interest rate
Total Fair Value, Liabilities	33		66
Noncurrent Liabilities
Total Fair Value, Liabilities	88	[4]	151	[4]
Noncurrent Liabilities | Commodity
Total Fair Value, Liabilities	88		151
Assets Held-for-sale
Derivative assets held for sale	7
Fair Value – Derivatives under Hedge Accounting
Total Fair Value, Assets	278		326
Total Fair Value, Liabilities	202		227
Fair Value – Derivatives under Hedge Accounting | Current Assets
Total Fair Value, Assets	128	[2]	139
Fair Value – Derivatives under Hedge Accounting | Current Assets | Commodity
Total Fair Value, Assets	94		103
Fair Value – Derivatives under Hedge Accounting | Current Assets | Interest rate
Total Fair Value, Assets	34		36
Fair Value – Derivatives under Hedge Accounting | Noncurrent Assets
Total Fair Value, Assets	150	[3]	187	[3]
Fair Value – Derivatives under Hedge Accounting | Noncurrent Assets | Commodity
Total Fair Value, Assets	106		130
Fair Value – Derivatives under Hedge Accounting | Noncurrent Assets | Interest rate
Total Fair Value, Assets	44		57
Fair Value – Derivatives under Hedge Accounting | Current Liabilities
Total Fair Value, Liabilities	156		169
Fair Value – Derivatives under Hedge Accounting | Current Liabilities | Commodity
Total Fair Value, Liabilities	123		103
Fair Value – Derivatives under Hedge Accounting | Current Liabilities | Interest rate
Total Fair Value, Liabilities	33		66
Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities
Total Fair Value, Liabilities	46	[4]	58	[4]
Fair Value – Derivatives under Hedge Accounting | Noncurrent Liabilities | Commodity
Total Fair Value, Liabilities	46		58
Fair Value – Derivatives not under Hedge Accounting
Total Fair Value, Assets	473		502
Total Fair Value, Liabilities	442		434
Fair Value – Derivatives not under Hedge Accounting | Current Assets
Total Fair Value, Assets	406	[2]	379
Fair Value – Derivatives not under Hedge Accounting | Current Assets | Commodity
Total Fair Value, Assets	406		379
Fair Value – Derivatives not under Hedge Accounting | Current Assets | Interest rate
Total Fair Value, Assets	0		0
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Assets
Total Fair Value, Assets	67	[3]	123	[3]
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity
Total Fair Value, Assets	67		123
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Assets | Interest rate
Total Fair Value, Assets	0		0
Fair Value – Derivatives not under Hedge Accounting | Current Liabilities
Total Fair Value, Liabilities	400		341
Fair Value – Derivatives not under Hedge Accounting | Current Liabilities | Commodity
Total Fair Value, Liabilities	400		341
Fair Value – Derivatives not under Hedge Accounting | Current Liabilities | Interest rate
Total Fair Value, Liabilities	0		0
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities
Total Fair Value, Liabilities	42	[4]	93	[4]
Fair Value – Derivatives not under Hedge Accounting | Noncurrent Liabilities | Commodity
Total Fair Value, Liabilities	42		93
Brayton Point and Kincaid | Assets Held-for-sale
Derivative assets held for sale	$ 7

[1] Dominion’s Consolidated Balance Sheet at December 31, 2012 has been derived from the audited Consolidated Financial Statements at that date.

[2] $7 million of current derivative assets are classified as assets held for sale in Dominion’s Consolidated Balance Sheet. See Note 3 for further information.

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

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