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Consolidated Statements of Comprehensive Income (Parentheticals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Change in Unrealized Gains (Losses) on Investments:
Tax effect on gains (losses) during the period	$ 0	$ 0	$ (1)
Benefit Obligations:
Tax effect on benefit obligations	$ (2)	$ 0	$ (1)

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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