Pension and Other Postretirement Benefits - Defined Benefit - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution plans, employer contribution	$ 58	$ 49	$ 44
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	1,069	1,319
Fair value of plan asset	801	972	788
Net amounts recognized	$ 1,203	$ 1,468	1,409
Actual Asset Allocation	100.00%	100.00%
Pension benefits \| Return Seeking Assets
Defined Benefit Plan Disclosure [Line Items]
Target Asset Allocation	50.00%
Pension benefits \| Liability Hedging Assets
Defined Benefit Plan Disclosure [Line Items]
Target Asset Allocation	50.00%
Pension benefits \| Overfunded Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 75
Fair value of plan asset	81
Net amounts recognized	75
Postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	0	$ 0	0
Net amounts recognized	$ 53	$ 98	$ 104

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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