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Investment gains/losses and other-than-temporary impairment losses on investments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Investment gains/losses [Line Items]
Investment gains/losses	$ 917	$ 100	$ 1,273	$ 1,488
Insurance and Other [Member]
Investment gains/losses [Line Items]
Investment gains/losses	725	100	1,057	1,314
Finance and Financial Products [Member]
Investment gains/losses [Line Items]
Investment gains/losses	192		216	174
Fixed Maturities [Member]
Investment gains/losses [Line Items]
Gross gains from sales and other disposals	77	31	168	207
Gross losses from sales and other disposals		(1)	(345)	(5)
Equity Securities and Other Investments [Member]
Investment gains/losses [Line Items]
Gross gains from sales and other disposals	645	40	1,218	1,308
Gross losses from sales and other disposals	(4)	(5)	(11)	(19)
Other Investment Gains / Losses [Member]
Investment gains/losses [Line Items]
Investment gains/losses	$ 199	$ 35	$ 243	$ (3)

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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