Pension and Other Postretirement Benefits (Schedule of Projected Benefit Obligation, Changes in Fair Value of Plan Assets and Funded Status) (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Change in the fair value of plan assets for the Company's benefit plans:
Grantor Trust assets		$ 304	$ 247
Pension Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year		1,409	1,255
Service cost		38	35
Interest cost		30	39
Benefits paid		(23)	(21)
Settlements	[1]	(51)	(45)
Actuarial losses (gains)	[2]	65	145
Other		0	1
Projected benefit obligation, end of the year		1,468	1,409
Change in the fair value of plan assets for the Company's benefit plans:
Fair value of plan assets, beginning of the year		788	800
Actual return on plan assets		195	24
Employer contributions		63	30
Benefits paid		(23)	(21)
Settlements	[1]	(51)	(45)
Fair value of plan assets, end of the year		972	788
Funded status	[3]	(496)	(621)
Grantor Trust assets	[3]	304	247
Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year		104	103
Service cost		2	2
Interest cost		2	3
Benefits paid		(4)	(3)
Settlements	[1]	0	0
Actuarial losses (gains)	[2]	(6)	(1)
Other		0	0
Projected benefit obligation, end of the year		98	104
Change in the fair value of plan assets for the Company's benefit plans:
Fair value of plan assets, beginning of the year		0	0
Actual return on plan assets		0	0
Employer contributions		4	3
Benefits paid		(4)	(3)
Settlements	[1]	0	0
Fair value of plan assets, end of the year		0	0
Funded status	[3]	(98)	(104)
Grantor Trust assets	[3]	$ 0	$ 0

[1] Represents the full settlement of former employees deferred pension benefit obligations through lump sum payments.

[2] Actuarial losses (gains) for June 30, 2021 were mainly due to a change in the discount rate assumption utilized in measuring plan obligations and changes to other economic assumptions and demographic experience. Actuarial losses for June 30, 2020 were mainly due to a change in the discount rate assumption utilized in measuring plan obligations.

[3] The Company has established an irrevocable grantor trust (the “Grantor Trust”), administered by an independent trustee, with the intention of making cash contributions to the Trust to fund certain future pension benefit obligations of the Company. The assets in the Grantor Trust are unsecured funds of the Company and can be used to satisfy the Company’s obligations in the event of bankruptcy or insolvency.