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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	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Other than Temporary Impairments [Line Items]
Other-than-temporary investment losses	$ 8	$ 337	$ 514
Equity Securities [Member]
Schedule of Other than Temporary Impairments [Line Items]
Other-than-temporary investment losses			506
Fixed Maturities [Member]
Schedule of Other than Temporary Impairments [Line Items]
Other-than-temporary investment losses	$ 8	$ 337	$ 8

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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