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

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.