Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Jun. 30, 2022
Assets:
Equity securities	$ 235	$ 212
Fair Value, Measurements, Recurring
Assets:
Equity securities	235	212
Total assets	324	335
Liabilities:
Total liabilities	(3)	0
Fair Value, Measurements, Recurring | Interest Rate Contract | Cash Flow Hedging
Assets:
Derivative assets	41	24
Fair Value, Measurements, Recurring | Foreign Currency Derivatives | Cash Flow Hedging
Assets:
Derivative assets	2	1
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives
Assets:
Derivative assets	37	79
Liabilities:
Derivative liabilities	(2)	0
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	9	19
Liabilities:
Derivative liabilities	(1)	0
Fair Value, Measurements, Recurring | Level 1
Assets:
Equity securities	105	109
Total assets	105	109
Liabilities:
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate Contract | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring | Level 1 | Cross Currency Interest Rate Derivatives
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 2
Assets:
Equity securities	0	0
Total assets	89	123
Liabilities:
Total liabilities	(3)	0
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Contract | Cash Flow Hedging
Assets:
Derivative assets	41	24
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Derivatives | Cash Flow Hedging
Assets:
Derivative assets	2	1
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives
Assets:
Derivative assets	37	79
Liabilities:
Derivative liabilities	(2)	0
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	9	19
Liabilities:
Derivative liabilities	(1)	0
Fair Value, Measurements, Recurring | Level 3
Assets:
Equity securities	130	103
Total assets	130	103
Liabilities:
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Interest Rate Contract | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Cross Currency Interest Rate Derivatives
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0