Long Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long Term Debt	$ 859	$ 855
Long Term Debt and Capital Lease Obligation Current	56	24
Long Term Debt and Capital Lease Obligation	803	831
Senior Notes 6.50 Percent Due 2019
Debt Instrument [Line Items]
Long Term Debt	400	400
Senior Notes 6.75 Percent Due 2021
Debt Instrument [Line Items]
Long Term Debt	350	350
Debt, Other
Debt Instrument [Line Items]
Long Term Debt	$ 109	$ 105