Registration of securities issued in business combination transactions

Income Taxes (Tax effects of temporary differences, deferred income tax assets/liabilites) (Details)

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Income Taxes (Tax effects of temporary differences, deferred income tax assets/liabilites) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:        
Accounts receivable, principally due to the allowance for doubtful accounts and related reserves for the uncollectible accounts   $ 29 $ 31  
Inventories, principally due to obsolescence reserves and additional costs of inventories for tax purposes pursuant to the Tax Reform Act of 1986   39 39  
Allowance for sales returns   33 31  
Deferred compensation   27 33  
Unrecognized federal and state tax benefits   31 32  
Accrued liabilities   29 27  
Other   42 42  
Subtotal   230 235  
Valuation allowance   (1) (1)  
Total deferred tax assets   229 234  
Deferred tax liabilities:        
Depreciation and amortization   (1,455) (1,579)  
Cumulative translation of foreign currencies   (33) (51)  
Total deferred tax liabilities   (1,488) (1,630)  
Net deferred tax liability   (1,259) (1,396)  
Tax benefit resulting from exercise of employee stock options $ 4 $ 20 $ 8 $ 7