v2.4.0.8
Investment Components, Including Associated Derivatives but Excluding Held to Maturity Investments (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis $ 93,308 $ 85,077    
Unrealized Gains 5,593 3,249    
Unrealized Losses (131) (460)    
Recorded Basis 98,770 [1] 87,866 [1]    
Cash and Cash Equivalents 8,669 3,804 6,938 9,610
Short-term Investments 77,040 73,218    
Equity and Other Investments 13,061 10,844    
Cash
        
Cash, Cash Equivalents and Investments [Line Items]        
Cash 4,980 1,967    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Cash 4,980 1,967    
Cash and Cash Equivalents 4,980 1,967    
Short-term Investments 0 0    
Equity and Other Investments 0 0    
Mutual funds
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 590 868    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 590 868    
Cash and Cash Equivalents 590 868    
Short-term Investments 0 0    
Equity and Other Investments 0 0    
Commercial paper
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 189 603    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 189 603    
Cash and Cash Equivalents 89 214    
Short-term Investments 100 389    
Equity and Other Investments 0 0    
Certificates of deposit
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 1,197 994    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 1,197 994    
Cash and Cash Equivalents 865 609    
Short-term Investments 332 385    
Equity and Other Investments 0 0    
U.S. government and agency securities
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 66,952 64,934    
Unrealized Gains 103 47    
Unrealized Losses (29) (84)    
Recorded Basis 67,026 64,897    
Cash and Cash Equivalents 109 146    
Short-term Investments 66,917 64,751    
Equity and Other Investments 0 0    
Foreign government bonds
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 3,328 900    
Unrealized Gains 17 16    
Unrealized Losses (10) (41)    
Recorded Basis 3,335 875    
Cash and Cash Equivalents 2,027 0    
Short-term Investments 1,308 875    
Equity and Other Investments 0 0    
Mortgage-backed securities
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 991 1,258    
Unrealized Gains 30 43    
Unrealized Losses (2) (13)    
Recorded Basis 1,019 1,288    
Cash and Cash Equivalents 0 0    
Short-term Investments 1,019 1,288    
Equity and Other Investments 0 0    
Corporate notes and bonds
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 6,845 4,993    
Unrealized Gains 191 169    
Unrealized Losses (9) (40)    
Recorded Basis 7,027 5,122    
Cash and Cash Equivalents 9 0    
Short-term Investments 7,018 5,122    
Equity and Other Investments 0 0    
Municipal securities
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 287 350    
Unrealized Gains 45 36    
Unrealized Losses 0 (1)    
Recorded Basis 332 385    
Cash and Cash Equivalents 0 0    
Short-term Investments 332 385    
Equity and Other Investments 0 0    
Common and preferred stock
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 6,785 6,931    
Unrealized Gains 5,207 2,938    
Unrealized Losses (81) (281)    
Recorded Basis 11,911 9,588    
Cash and Cash Equivalents 0 0    
Short-term Investments 0 0    
Equity and Other Investments 11,911 9,588    
Other investments
        
Cash, Cash Equivalents and Investments [Line Items]        
Cost Basis 1,164 1,279    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Recorded Basis 1,164 1,279    
Cash and Cash Equivalents 0 0    
Short-term Investments 14 23    
Equity and Other Investments $ 1,150 $ 1,256    
[1] Excludes held-to-maturity investments recorded at amortized cost and measured at fair value on a nonrecurring basis.