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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
Allowances for doubtful accounts, deducted from accounts receivable in the balance sheet [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 29 $ 34 $ 39
Charged to Costs and Expenses 11 8 15
Charged to Other Accounts         
Deductions (9) (13) (19)
Balance at End of Period 31 29 34
Valuation Allowance on deferred tax assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 688 462 43
Charged to Costs and Expenses 113 178 400
Charged to Other Accounts (14) 48 19
Deductions         
Balance at End of Period $ 787 $ 688 $ 462