Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023
Assets:
Equity securities	$ 208	$ 235
Fair Value, Recurring
Assets:
Equity securities	208	235
Total assets	249	324
Liabilities:
Total liabilities	0	(3)
Fair Value, Recurring | Interest rate derivatives - cash flow hedges | Cash Flow Hedging
Assets:
Derivative assets	38	41
Fair Value, Recurring | Foreign currency derivatives - cash flow hedges | Cash Flow Hedging
Assets:
Derivative assets	3	2
Fair Value, Recurring | Cross currency interest rate derivatives
Assets:
Derivative assets	0	37
Liabilities:
Derivative liabilities	0	(2)
Fair Value, Recurring | Cross currency interest rate derivatives | Fair Value Hedging
Assets:
Derivative assets	0	9
Liabilities:
Derivative liabilities	0	(1)
Fair Value, Recurring | Level 1
Assets:
Equity securities	80	105
Total assets	80	105
Liabilities:
Total liabilities	0	0
Fair Value, Recurring | Level 1 | Interest rate derivatives - cash flow hedges | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 1 | Foreign currency derivatives - cash flow hedges | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 1 | Cross currency interest rate derivatives
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Recurring | Level 1 | Cross currency interest rate derivatives | Fair Value Hedging
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Recurring | Level 2
Assets:
Equity securities	0	0
Total assets	41	89
Liabilities:
Total liabilities	0	(3)
Fair Value, Recurring | Level 2 | Interest rate derivatives - cash flow hedges | Cash Flow Hedging
Assets:
Derivative assets	38	41
Fair Value, Recurring | Level 2 | Foreign currency derivatives - cash flow hedges | Cash Flow Hedging
Assets:
Derivative assets	3	2
Fair Value, Recurring | Level 2 | Cross currency interest rate derivatives
Assets:
Derivative assets	0	37
Liabilities:
Derivative liabilities	0	(2)
Fair Value, Recurring | Level 2 | Cross currency interest rate derivatives | Fair Value Hedging
Assets:
Derivative assets	0	9
Liabilities:
Derivative liabilities	0	(1)
Fair Value, Recurring | Level 3
Assets:
Equity securities	128	130
Total assets	128	130
Liabilities:
Total liabilities	0	0
Fair Value, Recurring | Level 3 | Interest rate derivatives - cash flow hedges | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 3 | Foreign currency derivatives - cash flow hedges | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Recurring | Level 3 | Cross currency interest rate derivatives
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Recurring | Level 3 | Cross currency interest rate derivatives | Fair Value Hedging
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0