Income Taxes - Taxes Receivable (Payable) Table (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Income Tax Receivable (Payable) [Line Items]
Income taxes receivable	$ 101	$ 181
Net income taxes receivable (payable)	19	143
Accounts Receivable - Other [Member]
Components of Income Tax Receivable (Payable) [Line Items]
Income taxes receivable	66	179
Other Assets [Member]
Components of Income Tax Receivable (Payable) [Line Items]
Income taxes receivable	35	2
Accrued Expense [Member]
Components of Income Tax Receivable (Payable) [Line Items]
Income taxes (payable)	$ (82)	$ (38)