Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Jun. 30, 2022
Assets:
Equity securities	$ 227	$ 212
Fair Value, Recurring
Assets:
Equity securities	227	212
Total assets	304	335
Liabilities:
Total liabilities	0	0
Fair Value, Recurring | Interest rate derivatives | Cash Flow Hedging
Assets:
Derivative assets	33	24
Fair Value, Recurring | Foreign currency derivatives | Cash Flow Hedging
Assets:
Derivative assets	1	1
Fair Value, Recurring | Cross currency interest rate derivatives
Assets:
Derivative assets	35	79
Fair Value, Recurring | Cross currency interest rate derivatives | Fair Value Hedging
Assets:
Derivative assets	8	19
Fair Value, Recurring | Level 1
Assets:
Equity securities	97	109
Total assets	97	109
Liabilities:
Total liabilities	0	0
Fair Value, Recurring | Level 1 | Interest rate derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 1 | Foreign currency derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 1 | Cross currency interest rate derivatives
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 1 | Cross currency interest rate derivatives | Fair Value Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 2
Assets:
Equity securities	0	0
Total assets	77	123
Liabilities:
Total liabilities	0	0
Fair Value, Recurring | Level 2 | Interest rate derivatives | Cash Flow Hedging
Assets:
Derivative assets	33	24
Fair Value, Recurring | Level 2 | Foreign currency derivatives | Cash Flow Hedging
Assets:
Derivative assets	1	1
Fair Value, Recurring | Level 2 | Cross currency interest rate derivatives
Assets:
Derivative assets	35	79
Fair Value, Recurring | Level 2 | Cross currency interest rate derivatives | Fair Value Hedging
Assets:
Derivative assets	8	19
Fair Value, Recurring | Level 3
Assets:
Equity securities	130	103
Total assets	130	103
Liabilities:
Total liabilities	0	0
Fair Value, Recurring | Level 3 | Interest rate derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 3 | Foreign currency derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 3 | Cross currency interest rate derivatives
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 3 | Cross currency interest rate derivatives | Fair Value Hedging
Assets:
Derivative assets	$ 0	$ 0