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Newly Adopted Accounting Standards (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011 Dominion [Member]
Cumulative effect of change in accounting principle, before taxes	$ 20	$ 20
Cumulative effect of change in accounting principle, after-tax	$ 12	$ 12

The pretax effect on other comprehensive income of a change in accounting principle recognized in the period, which occurred before retrospective adjustments were required, or is in lieu of retrospective adjustments.

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- Definition

The after tax effect on other comprehensive income of a change in accounting principle recognized in the period, which occurred before retrospective adjustments were required, or is in lieu of retrospective adjustments.

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