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Investment gains/losses (Detail) (USD $) In Millions	3 Months Ended		6 Months Ended
Investment gains/losses (Detail) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Investment gains/losses [Line Items]
Investment gains/losses	$ 1,289	$ 383	$ 1,388	$ 1,701
Insurance and Other [Member]
Investment gains/losses [Line Items]
Investment gains/losses	1,128	381	1,214	1,696
Finance and Financial Products [Member]
Investment gains/losses [Line Items]
Investment gains/losses	161	2	174	5
Fixed Maturities [Member]
Investment gains/losses [Line Items]
Gross gains from sales and other disposals	94	270	176	568
Gross losses from sales and other disposals	(4)		(4)	(3)
Equity Securities [Member]
Investment gains/losses [Line Items]
Gross gains from sales and other disposals	1,267	123	1,268	335
Gross losses from sales and other disposals	(4)	(17)	(14)	(189)
Other Investment Gain / Loss [Member]
Investment gains/losses [Line Items]
Investment gains/losses	$ (64)	$ 7	$ (38)	$ 990

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting.

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