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Reconciliation of Federal Statutory Income Tax Rate to Effective Income Tax Rate (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Statutory Federal Tax Rate [Line Items]      
Expected provision at federal statutory tax rate (35%) $ 4,685 $ 4,314 $ 3,779
State taxes, net of federal benefit 99 122 322
Stock-based compensation expense 52 105 79
Change in valuation allowance 1,921 27 (34)
Foreign rate differential (2,200) (2,001) (1,769)
Federal research credit 0 (140) (84)
Tax exempt interest (7) (10) (12)
Non-deductible legal settlement 0 175 0
Basis difference in investment in Home business (1,960) 0 0
Other permanent differences 8 (3) 10
Provision for income taxes $ 2,598 $ 2,589 $ 2,291