Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Income Tax Contingency [Line Items]
Current Federal Tax Expense (Benefit)	$ (989)	$ 659	$ 295
Current State and Local Tax Expense (Benefit)	92	154	89
Current Foreign Tax Expense (Benefit)	112	69	85
Current Income Tax Expense (Benefit)	(785)	882	469
Deferred Federal Income Tax Expense (Benefit)	539	(822)	(28)
Deferred State and Local Income Tax Expense (Benefit)	(28)	(127)	(37)
Deferred Foreign Income Tax Expense (Benefit)	(15)	(12)	(18)
Deferred Income Tax Expense (Benefit)	496	(961)	(83)
Income Tax Expense (Benefit)	(289)	(79)	386
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of fiscal year	998	456	423
Additions for tax positions of the current year	121	500	24
Additions for tax positions of prior years	223	78	39
Reductions for tax positions of prior years	(138)	(27)	(5)
Settlements with tax authorities	(271)	(6)	(25)
Expiration of the statute of limitations	(1)	(3)	0
Balance at end of fiscal year	$ 932	$ 998	$ 456