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Rollforward of Credit Losses Recognized in Earnings Related to Securities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Beginning balance	$ 31	$ 25
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	1	2
Ending balance	$ 32	$ 27

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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