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Insurance In Force (Summary Of Components Of Financial Guarantee Net Premiums Earned, Including Premiums Assumed From And Ceded To Other Companies) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Insurance in Force [Abstract]
Direct	$ 407us-gaap_DirectPremiumsEarned	$ 400us-gaap_DirectPremiumsEarned	$ 489us-gaap_DirectPremiumsEarned
Assumed	2us-gaap_AssumedPremiumsEarned	67us-gaap_AssumedPremiumsEarned	130us-gaap_AssumedPremiumsEarned
Gross	409	467	619
Ceded premiums earned	(12)us-gaap_CededPremiumsEarned	(10)us-gaap_CededPremiumsEarned	(14)us-gaap_CededPremiumsEarned
Premiums earned (net of ceded premiums of $12, $10 and $14)	$ 397us-gaap_PremiumsEarnedNet	$ 457us-gaap_PremiumsEarnedNet	$ 605us-gaap_PremiumsEarnedNet

Amount of earned premiums ceded to other entities.

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.