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Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year $ 107 $ 107 $ 95
Additions (Deductions) charged to costs and expenses 6 9 39
Charge off's and other 7 (9) (27)
Balance end of year 120 107 107
Allowance for excess and obsolete inventories [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 281 270 206
Additions (Deductions) charged to costs and expenses 99 70 106
Charge off's and other (42) (59) (42)
Balance end of year 338 281 270
Valuation allowance for deferred tax assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 13 9 8
Additions (Deductions) charged to costs and expenses 80 4 1
Charge off's and other         
Balance end of year 93 13 9
Warranty reserve [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance beginning of year 211 215 217
Additions (Deductions) charged to costs and expenses 51 40 52
Charge off's and other (68) (44) (54)
Balance end of year $ 194 $ 211 $ 215