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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Change in unrealized holding gains on investments, tax expense	$ 41	$ 4
Reclassification adjustment for gross gains included in net income, tax expense	2	7
Unrealized gains transferred to noncontrolling interest on sale of life affiliate, tax expense	$ 0	$ 4

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.