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Schedule I - Condensed Financial Information of Parent Company - Revision to Prior Period Financial Statements (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment in consolidated companies	$ 3,935	$ 2,633
Retained earnings	595	1,077	1,040	1,027
Total equity	4,315	4,414	4,304	4,198
As Filed [Member]
Retained earnings		1,109	1,072	1,059
Total equity		4,446	4,336	4,230
Adjustment [Member]
Retained earnings		(32)	(32)	(32)
Total equity		(32)	(32)	(32)
Parent Company [Member]
Investment in consolidated companies		2,633	2,319	1,632
Total investments and other assets	5,370	5,318	5,198	4,927
Retained earnings	595	1,077	1,040	1,027
Total equity		4,414	4,304	4,198
Parent Company [Member] \| As Filed [Member]
Investment in consolidated companies		2,665	2,351	1,664
Total investments and other assets		5,350	5,230	4,959
Retained earnings		1,109	1,072	1,059
Total equity		4,446	4,336	4,230
Parent Company [Member] \| Adjustment [Member]
Investment in consolidated companies		(32)	(32)	(32)
Total investments and other assets		(32)	(32)	(32)
Retained earnings		(32)	(32)	(32)
Total equity		$ (32)	$ (32)	$ (32)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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