Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Benefit Plans [Line Items]
Employee waiting period after hire to participate in the defined contribution plans	90 days
Employee maximum contribution towards defined contribution plans as percentage of annual compensation	25.00%
Employer's match in cash of employee contributions on first specified percentage of eligible compensation	100.00%
First percentage of eligible compensation on which specified percentage of contribution is matched by the employer in cash	3.00%
Employer's match in cash of employee contributions on next specified percentage of eligible compensation	50.00%
Next percentage of eligible compensation on which specified percentage of contribution is matched by the employer in cash	3.00%
Employer maximum match of employee contribution on eligible compensation	4.50%
Operating, selling, general and administrative expenses for our defined contribution plans	$ 63	$ 61	$ 55
Accrued benefit liabilities for defined benefit pension and other post retirement plans	72
Charge to "Operating" expenses for the agreed-upon withdrawal of bargaining units from multi-employer pension plans	10		26
Pension Plans [Member]
Employee Benefit Plans [Line Items]
Combined accumulated benefit obligation of pension plans	105
Plan assets of pension plans	73
Unfunded benefit obligation of pension and other post-retirement plans	32
Other Postretirement Plans [Member]
Employee Benefit Plans [Line Items]
Unfunded benefit obligation of pension and other post-retirement plans	$ 40