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Valuation and Qualifying Accounts (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance for Doubtful Accounts [Member]
      
Valuation of Qualifying Accounts      
Balance beginning of year $ 107 $ 95 $ 73
Additions (Deductions) charged to costs and expenses 9 39 53
Charge off's and other (9) (27) (31)
Balance end of year 107 107 95
Allowance for excess and obsolete inventories [Member]
      
Valuation of Qualifying Accounts      
Balance beginning of year 270 206 123
Additions (Deductions) charged to costs and expenses 70 106 100
Charge off's and other (59) (42) (17)
Balance end of year 281 270 206
Valuation allowance for deferred tax assets [Member]
      
Valuation of Qualifying Accounts      
Balance beginning of year 9 8 10
Additions (Deductions) charged to costs and expenses 4 1 0
Charge off's and other 0 0 (2)
Balance end of year 13 9 8
Warranty reserve [Member]
      
Valuation of Qualifying Accounts      
Balance beginning of year 215 217 114
Additions (Deductions) charged to costs and expenses 40 52 144
Charge off's and other (44) (54) (41)
Balance end of year $ 211 $ 215 $ 217