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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, 2013	Dec. 31, 2012	Dec. 31, 2011
Insurance in Force [Abstract]
Direct	$ 400	$ 489	$ 505
Assumed	67	130	112
Gross	467	619	617
Ceded premiums earned	(10)	(14)	(12)
Premiums earned (net of ceded premiums of $10, $14 and $12)	$ 457	$ 605	$ 605

Amount of earned premiums ceded to other entities.

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