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Investment Components, Including Associated Derivatives (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis $ 70,584 $ 60,804    
Unrealized Gains 2,716 3,052    
Unrealized Losses (484) (219)    
Recorded Basis 72,816 63,637    
Cash and Cash Equivalents 6,938 9,610 5,505 6,076
Short-term Investments 56,102 43,162    
Equity and Other Investments 9,776 10,865    
Cash
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 2,019 1,648    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 2,019 1,648    
Cash and Cash Equivalents 2,019 1,648    
Short-term Investments 0 0    
Equity and Other Investments 0 0    
Mutual funds
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 820 1,752    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 820 1,752    
Cash and Cash Equivalents 820 1,752    
Short-term Investments 0 0    
Equity and Other Investments 0 0    
Commercial paper
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 96 639    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 96 639    
Cash and Cash Equivalents 96 414    
Short-term Investments 0 225    
Equity and Other Investments 0 0    
Certificates of deposit
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 744 598    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 744 598    
Cash and Cash Equivalents 342 372    
Short-term Investments 402 226    
Equity and Other Investments 0 0    
U.S. government and agency securities
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 47,178 33,607    
Unrealized Gains 130 162    
Unrealized Losses (2) (7)    
Recorded Basis 47,306 33,762    
Cash and Cash Equivalents 561 2,049    
Short-term Investments 46,745 31,713    
Equity and Other Investments 0 0    
Foreign government bonds
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 1,741 658    
Unrealized Gains 18 11    
Unrealized Losses (29) (2)    
Recorded Basis 1,730 667    
Cash and Cash Equivalents 575 0    
Short-term Investments 1,155 667    
Equity and Other Investments 0 0    
Mortgage-backed securities
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 1,816 2,307    
Unrealized Gains 82 121    
Unrealized Losses (2) (4)    
Recorded Basis 1,896 2,424    
Cash and Cash Equivalents 0 0    
Short-term Investments 1,896 2,424    
Equity and Other Investments 0 0    
Corporate notes and bonds
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 7,799 10,575    
Unrealized Gains 224 260    
Unrealized Losses (15) (11)    
Recorded Basis 8,008 10,824    
Cash and Cash Equivalents 2,525 3,375    
Short-term Investments 5,483 7,449    
Equity and Other Investments 0 0    
Municipal securities
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 358 441    
Unrealized Gains 58 15    
Unrealized Losses 0 (2)    
Recorded Basis 416 454    
Cash and Cash Equivalents 0 0    
Short-term Investments 416 454    
Equity and Other Investments 0 0    
Common and preferred stock
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 6,965 7,925    
Unrealized Gains 2,204 2,483    
Unrealized Losses (436) (193)    
Recorded Basis 8,733 10,215    
Cash and Cash Equivalents 0 0    
Short-term Investments 0 0    
Equity and Other Investments 8,733 10,215    
Other investments
       
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 1,048 654    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 1,048 654    
Cash and Cash Equivalents 0 0    
Short-term Investments 5 4    
Equity and Other Investments $ 1,043 $ 650