Reconciliation of Total Assets Measured at Fair Value on Recurring Basis to Balance Sheet Presentation (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Jun. 30, 2016
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	$ 129,037	$ 119,019
Other liabilities	(18)
Other assets		12
Recorded basis of investment components	133,399	123,671
Other Current and Long-term Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less derivative net assets classified as other current and long-term assets	(385)	(246)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	3,390	3,501
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	856	767
Other investments measured at fair value on a nonrecurring basis	$ 519	$ 618