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Long-Term Employee Benefit Liabilities - Company's Retirement Medical Benefits Plans (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Benefit Plans [Line Items]      
Non-current liability $ 560 $ 419 $ 356
Retirement Medical Benefits Plans [Member]
      
Employee Benefit Plans [Line Items]      
Beginning of year 39 36 36
Interest cost 2 2 2
Actuarial losses and changes in actuarial assumptions 3 4 1
Benefits paid (3) (3) (3)
Ending funded status 41 39 36
Current liability 2 2 2
Non-current liability 39 37 34
Net amount 41 39 36
Unrecognized past service costs 3 3 4
Unrecognized actuarial gains 8 12 18
Total accumulated other comprehensive income 11 15 22
Interest cost 2 2 2
Actuarial gains (1) (1) (1)
Past service cost amortization 0 (1) 0
Net periodic benefit cost $ 1 $ 0 $ 1