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Investment gains/losses and other-than-temporary impairment losses on investments (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment gains/losses [Line Items]
Investment gains/losses	$ 1,799	$ 2,182	$ 4,058
Insurance and Other [Member]
Investment gains/losses [Line Items]
Investment gains/losses	1,327	1,973	4,044
Finance and Financial Products [Member]
Investment gains/losses [Line Items]
Investment gains/losses	472	209	14
Fixed Maturities [Member]
Investment gains/losses [Line Items]
Gross gains from sales and other disposals	188	310	720
Gross losses from sales and other disposals	(354)	(10)	(16)
Equity Securities and Other Investments [Member]
Investment gains/losses [Line Items]
Gross gains from sales and other disposals	1,468	1,889	2,603
Gross losses from sales and other disposals	(12)	(36)	(266)
Other Investment Gains / Losses [Member]
Investment gains/losses [Line Items]
Investment gains/losses	$ 509	$ 29	$ 1,017

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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