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Schedule of Summarized Financial Information for Equity Investees Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Current assets	$ 3,983	$ 3,516
Noncurrent assets	7,748	8,159
Total assets	11,731	11,675
Current liabilities	4,692	5,526
Noncurrent liabilities	5	5
Equity	7,034	6,144
Total liabilities and equity	$ 11,731	$ 11,675

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

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

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

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