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Combined Summarized Balance Sheet Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Asset Reconciling Item [Line Items]
Property and equipment, net	$ 2,480	$ 2,289
Other assets	376	312
Total assets	2,856	2,601
Debt	1,476	1,414
Other liabilities	135	164
Equity	1,245	1,023
Total liabilities and equity	$ 2,856	$ 2,601

The amount of assets reported by an equity method investment of the entity.

The amount of liabilities and equity reported by an equity method investment of the entity.

The amount of noncurrent liabilities reported by an equity method investment of the entity.