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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, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of Statutory Federal Tax Rate [Line Items]      
Expected provision at federal statutory tax rate (35%) $ 4,314 $ 3,779 $ 2,933
State taxes, net of federal benefit 122 322 302
Stock-based compensation expense 105 79 63
Change in valuation allowance 27 (34) (41)
Foreign rate differential (2,001) (1,769) (1,339)
Federal research credit (140) (84) (56)
Tax exempt interest (10) (12) (15)
Non-deductible legal settlement 175 0 0
Other permanent differences (3) 10 14
Provision for income taxes $ 2,589 $ 2,291 $ 1,861