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, 2022	Jun. 30, 2021
Change in the fair value of plan assets for the Company's benefit plans:
Grantor Trust assets	$ 270	$ 304
Pension benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year	1,468	1,409
Service cost	38	38
Interest cost	30	30
Benefits paid	(22)	(23)
Settlements	(56)	(51)
Actuarial losses (gains)	(256)	65
Other	1	0
Projected benefit obligation, end of the year	1,203	1,468
Change in the fair value of plan assets for the Company's benefit plans:
Fair value of plan assets, beginning of the year	972	788
Actual return on plan assets	(152)	195
Employer contributions	59	63
Benefits paid	(22)	(23)
Settlements	(56)	(51)
Fair value of plan assets, end of the year	801	972
Funded status	(402)	(496)
Grantor Trust assets	270	304
Postretirement benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year	98	104
Service cost	1	2
Interest cost	2	2
Benefits paid	(4)	(4)
Settlements	0	0
Actuarial losses (gains)	(46)	(6)
Other	2	0
Projected benefit obligation, end of the year	53	98
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	4
Benefits paid	(4)	(4)
Settlements	0	0
Fair value of plan assets, end of the year	0	0
Funded status	(53)	(98)
Grantor Trust assets	$ 0	$ 0