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Significant Accounting Policies (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policy [Line Items]
Unrealized gains (losses) arising during the period	$ (213)	$ 176	$ 277
Foreign currency translation gains (losses)	3	24	(13)
Controlling Financial Interest In Or Exert Significant Influence Over An Entity	20.00%
Percentage Of Qualified Financial Guarantee Contracts	94.00%
Previously reported [Member]
Accounting Policy [Line Items]
Unrealized gains (losses) arising during the period		217	298
Foreign currency translation gains (losses)		$ 17	$ 34

Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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