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Long-term Debt (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2011
Jun. 30, 2010
Debt Instrument [Line Items]      
Notes $ 10,750 $ 10,750  
Total unamortized discount (62) (79)  
Total 11,938 11,921 [1]  
Notes 0.875 Percent Due September 27th 2013
      
Debt Instrument [Line Items]      
Debt maturity date Sep. 27, 2013 Sep. 27, 2013  
Notes 1,000 1,000  
Stated Interest Rate 0.875% 0.875%  
Effective Interest Rate 1.00% 1.00%  
Notes 0.875 Percent Due September 27th 2013 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --03-15 --03-15  
Interest Pay Date --03-27 --03-27  
Notes 0.875 Percent Due September 27th 2013 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --09-15 --09-15  
Interest Pay Date --09-27 --09-27  
Notes 2.95 Percent Due June 1st 2014
      
Debt Instrument [Line Items]      
Debt maturity date Jun. 01, 2014 Jun. 01, 2014  
Notes 2,000 2,000  
Stated Interest Rate 2.95% 2.95%  
Effective Interest Rate 3.049% 3.049%  
Notes 2.95 Percent Due June 1st 2014 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --05-15 --05-15  
Interest Pay Date --06-01 --06-01  
Notes 2.95 Percent Due June 1st 2014 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --11-15 --11-15  
Interest Pay Date --12-01 --12-01  
Notes 1.625 Percent Due September 25th 2015
      
Debt Instrument [Line Items]      
Debt maturity date Sep. 25, 2015 Sep. 25, 2015  
Notes 1,750 1,750  
Stated Interest Rate 1.625% 1.625%  
Effective Interest Rate 1.795% 1.795%  
Notes 1.625 Percent Due September 25th 2015 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --03-15 --03-15  
Interest Pay Date --03-25 --03-25  
Notes 1.625 Percent Due September 25th 2015 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --09-15 --09-15  
Interest Pay Date --09-25 --09-25  
Notes 2.5 Percent Due February 8th 2016
      
Debt Instrument [Line Items]      
Debt maturity date Feb. 08, 2016 Feb. 08, 2016  
Notes 750 750  
Stated Interest Rate 2.50% 2.50%  
Effective Interest Rate 2.642% 2.642%  
Notes 2.5 Percent Due February 8th 2016 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --02-01 --02-01  
Interest Pay Date --02-08 --02-08  
Notes 2.5 Percent Due February 8th 2016 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --08-01 --08-01  
Interest Pay Date --08-08 --08-08  
Notes 4.2 Percent Due June 1st 2019
      
Debt Instrument [Line Items]      
Debt maturity date Jun. 01, 2019 Jun. 01, 2019  
Notes 1,000 1,000  
Stated Interest Rate 4.20% 4.20%  
Effective Interest Rate 4.379% 4.379%  
Notes 4.2 Percent Due June 1st 2019 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --05-15 --05-15  
Interest Pay Date --06-01 --06-01  
Notes 4.2 Percent Due June 1st 2019 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --11-15 --11-15  
Interest Pay Date --12-01 --12-01  
Notes 3.0 Percent Due October 1st 2020
      
Debt Instrument [Line Items]      
Debt maturity date Oct. 01, 2020 Oct. 01, 2020  
Notes 1,000 1,000  
Stated Interest Rate 3.00% 3.00%  
Effective Interest Rate 3.137% 3.137%  
Notes 3.0 Percent Due October 1st 2020 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --03-15 --03-15  
Interest Pay Date --04-01 --04-01  
Notes 3.0 Percent Due October 1st 2020 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --09-15 --09-15  
Interest Pay Date --10-01 --10-01  
Notes 4.0 Percent Due February 8th 2021
      
Debt Instrument [Line Items]      
Debt maturity date Feb. 08, 2021 Feb. 08, 2021  
Notes 500 500  
Stated Interest Rate 4.00% 4.00%  
Effective Interest Rate 4.082% 4.082%  
Notes 4.0 Percent Due February 8th 2021 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --02-01 --02-01  
Interest Pay Date --02-08 --02-08  
Notes 4.0 Percent Due February 8th 2021 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --08-01 --08-01  
Interest Pay Date --08-08 --08-08  
Notes 5.2 Percent Due June 1st 2039
      
Debt Instrument [Line Items]      
Debt maturity date Jun. 01, 2039 Jun. 01, 2039  
Notes 750 750  
Stated Interest Rate 5.20% 5.20%  
Effective Interest Rate 5.24% 5.24%  
Notes 5.2 Percent Due June 1st 2039 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --05-15 --05-15  
Interest Pay Date --06-01 --06-01  
Notes 5.2 Percent Due June 1st 2039 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --11-15 --11-15  
Interest Pay Date --12-01 --12-01  
Notes 4.5 Percent Due October 1st 2040
      
Debt Instrument [Line Items]      
Debt maturity date Oct. 01, 2040 Oct. 01, 2040  
Notes 1,000 1,000  
Stated Interest Rate 4.50% 4.50%  
Effective Interest Rate 4.567% 4.567%  
Notes 4.5 Percent Due October 1st 2040 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --03-15 --03-15  
Interest Pay Date --04-01 --04-01  
Notes 4.5 Percent Due October 1st 2040 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --09-15 --09-15  
Interest Pay Date --10-01 --10-01  
Notes 5.3 Percent Due February 8th 2041
      
Debt Instrument [Line Items]      
Debt maturity date Feb. 08, 2041 Feb. 08, 2041  
Notes 1,000 1,000  
Stated Interest Rate 5.30% 5.30%  
Effective Interest Rate 5.361% 5.361%  
Notes 5.3 Percent Due February 8th 2041 | Semi Annual Payment, First Payment
      
Debt Instrument [Line Items]      
Interest Record Date --02-01 --02-01  
Interest Pay Date --02-08 --02-08  
Notes 5.3 Percent Due February 8th 2041 | Semi Annual Payment, Second Payment
      
Debt Instrument [Line Items]      
Interest Record Date --08-01 --08-01  
Interest Pay Date --08-08 --08-08  
Convertible Debt
      
Debt Instrument [Line Items]      
Debt maturity date Jun. 15, 2013 Jun. 15, 2013  
Convertible debt 1,250 1,250 1,250
Stated Interest Rate 0.00% 0.00%  
Effective Interest Rate 1.849% 1.849%  
Total unamortized discount $ (24)    
[1] Derived from audited financial statements.