- Summary of Long-Term Debt Obligations (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Secured debt	$ 376	[1]
Long-term debt (including current maturities)	1,021		1,070
Less - maturities classified as current	2		3
Total long-term debt	1,019		1,067
Revolver Borrowings due 2017
Debt Instrument [Line Items]
Secured debt	58		92
Senior Term Loan due 2014 through 2017
Debt Instrument [Line Items]
Secured debt	228		241
7 3/4% Senior Notes due 2018
Debt Instrument [Line Items]
Unsecured debt	225		225
6 7/8% Senior Notes due 2020
Debt Instrument [Line Items]
Unsecured debt	500		500
Debentures due 2014 through 2026
Debt Instrument [Line Items]
Unsecured debt	1		1
Customer Notes due 2013
Debt Instrument [Line Items]
Unsecured debt	0		1
Notes due 2014 through 2026
Debt Instrument [Line Items]
Unsecured debt	$ 9		$ 10

[1] We generally are required to pay commitment fees on the unused portion of the total commitment.