Reconciliation of Total Assets Measured at Fair Value on Recurring Basis to Balance Sheet Presentation (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net fair value of assets measured at fair value on a recurring basis	$ 109,979	$ 104,369
Other assets	6	4
Recorded basis of investment components	114,129	108,554
Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less derivative net assets classified as other current assets	(628)	(648)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	3,480	3,679
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Common and preferred stock measured at fair value on a nonrecurring basis	727	561
Other investments measured at fair value on a nonrecurring basis	$ 565	$ 589