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Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Stockholders' Equity [Abstract]
Unrealized investment losses/gains, tax	$ 109	$ 47	$ 131
Reclassification adjustment for net realized losses/gains included in net income, tax	$ 4	$ 2	$ 7

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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