Schedule II - Valuations and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 687	$ 626	$ 494	$ 541
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	(2,353)	(2,513)	(2,347)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account	1	1	1
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	2,293	2,381	2,395
Pricing Disputes [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	(60)	(37)	(27)
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	193	139	137	135
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	(140)	(113)	(59)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account	1	1	1
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	87	111	58
Prior Year Recoveries
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Addition, Recovery	1	1	1
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	14	7	9	19
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	(8)	(2)	(3)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account	0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	1	0	13
Sales Returns and Allowances [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	479	479	347	386
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	(2,205)	(2,402)	(2,285)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account	0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	2,205	2,270	2,324
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	1	1	1	$ 1
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account	0	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	$ 0	$ 0	$ 0