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Schedule II (Detail) - Valuation and Qualifying Accounts (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
From Current Receivables:      
Valuation Allowance and Reserves Balance $ 51 $ 77 $ 98
Valuation Allowance and Reserves Charges to Earnings and Equity 40 32 43
Valuation Allowance and Reserves Amounts Written Off 35 58 64
Valuation Allowance and Reserves Balance 56 51 77
Allowance for Doubtful Accounts [Member]
      
From Current Receivables:      
Valuation Allowance and Reserves Balance 39 63 79
Valuation Allowance and Reserves Charges to Earnings and Equity 28 10 19
Valuation Allowance and Reserves Amounts Written Off 17 34 35
Valuation Allowance and Reserves Balance 50 39 63
Allowance for Sales Returns [Member]
      
From Current Receivables:      
Valuation Allowance and Reserves Balance 12 14 19
Valuation Allowance and Reserves Charges to Earnings and Equity 12 22 24
Valuation Allowance and Reserves Amounts Written Off 18 24 29
Valuation Allowance and Reserves Balance 6 12 14
Deferred Tax Assets Valuation Allowance [Member]
      
From Current Receivables:      
Valuation Allowance and Reserves Balance 2,560 2,335 2,092
Valuation Allowance and Reserves Charges to Earnings and Equity 807 505 460
Valuation Allowance and Reserves Amounts Written Off 529 280 217
Valuation Allowance and Reserves Balance $ 2,838 $ 2,560 $ 2,335