v2.4.0.6
Postretirement Benefit Plans - Summary of Changes in Pension Benefit Obligations and Defined-Benefit Pension Plan Assets (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Service cost $ 11 $ 12 $ 12
Interest cost 14 15 15
Fair value of plan assets at end of year 162    
Projected Benefit Obligation [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Projected benefit obligation at beginning of year 342 347  
Additions   3  
Service cost 11 12  
Interest cost 14 15  
Actuarial (gains) and losses 60 (5)  
Curtailments and settlements (2) (6)  
Plan amendments   (1)  
Benefits paid (18) (13)  
Exchange rate differences 12 (10)  
Projected benefit obligation at end of year 419 342  
Plan Assets [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets at beginning of year 147 148  
Actual return on plan assets 14 10  
Employer contributions 14 13  
Curtailments and settlements   (6)  
Benefits paid (18) (13)  
Exchange rate differences 5 (5)  
Fair value of plan assets at end of year 162 147  
Funded Plans with Assets Less than Accumulated Benefit Obligation [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Funded status (257) (195)  
Classification Of Funded Status [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Prepaid pension cost within other non-current assets 13 25  
Accrued pension cost within other non-current liabilities (260) (211)  
Accrued pension cost within accrued liabilities (10) (9)  
Funded status (257) (195)  
Accumulated Benefit Obligation [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Accumulated benefit obligations 364 299  
Plans with Assets Less Than Accumulated Benefit Obligation [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 24 22  
Accumulated benefit obligations 65 60  
Projected benefit obligations 85 79  
Accumulated benefit obligations 174 140  
Projected benefit obligations 194 153  
Accumulated Other Comprehensive Income (Loss) [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Total AOCI at beginning of year (30) (21)  
Net actuarial loss (gain) 52 (9)  
Prior service cost (credit)   (1)  
Exchange rate differences   1  
Total AOCI at end of year 22 (30)  
Changes in Accumulated Other Comprehensive Income (Before Tax) [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Total net actuarial loss (gain) at beginning of year (30) (22)  
Net actuarial loss (gain) 52 (9)  
Net actuarial (loss) gain recognized in income during the year        
Exchange rate difference   1  
Total net actuarial loss (gain) at end of year 22 (30)  
Prior Service Cost (Credit) [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Total prior service cost (credit) at beginning of year   1  
Prior service cost (credit)   (1)  
Total prior service cost (credit) at end of year   $ 0