Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023
Assets:
Equity securities	$ 214	$ 235
Fair Value, Measurements, Recurring
Assets:
Equity securities	214	235
Total assets	243	324
Liabilities:
Total liabilities	(2)	(3)
Fair Value, Measurements, Recurring | Interest Rate Contract | Cash Flow Hedging
Assets:
Derivative assets	29	41
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Foreign Currency Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	2
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives
Assets:
Derivative assets	0	37
Liabilities:
Derivative liabilities	0	(2)
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Liabilities:
Derivative liabilities	(2)	0
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	0	9
Liabilities:
Derivative liabilities	0	(1)
Fair Value, Measurements, Recurring | Level 1
Assets:
Equity securities	53	105
Total assets	53	105
Liabilities:
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate Contract | Cash Flow Hedging
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	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 | Cash Flow Hedging
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	39	0
Total assets	68	89
Liabilities:
Total liabilities	(2)	(3)
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Contract | Cash Flow Hedging
Assets:
Derivative assets	29	41
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	2
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives
Assets:
Derivative assets	0	37
Liabilities:
Derivative liabilities	0	(2)
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Liabilities:
Derivative liabilities	(2)	0
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	0	9
Liabilities:
Derivative liabilities	0	(1)
Fair Value, Measurements, Recurring | Level 3
Assets:
Equity securities	122	130
Total assets	122	130
Liabilities:
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Interest Rate Contract | Cash Flow Hedging
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	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 | Cash Flow Hedging
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