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Investment gains/losses and other-than-temporary impairment losses on investments - Other-than-temporary impairment losses (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Other than Temporary Impairments [Line Items]
Other-than-temporary investment losses	$ 337	$ 908	$ 1,973
Equity Securities [Member]
Schedule of Other than Temporary Impairments [Line Items]
Other-than-temporary investment losses		506	953
Fixed Maturities [Member]
Schedule of Other than Temporary Impairments [Line Items]
Other-than-temporary investment losses	$ 337	$ 402	$ 1,020

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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