Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Assets:
Equity securities	$ 280	$ 177
Fair Value, Measurements, Recurring
Assets:
Equity securities	280	177
Total assets	371	299
Liabilities:
Total liabilities	22	37
Fair Value, Measurements, Recurring | Foreign Currency Derivatives | Cash Flow Hedging
Liabilities:
Derivative liabilities	0	3
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives
Assets:
Derivative assets	73	0
Liabilities:
Derivative liabilities	13	0
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	18	24
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	98
Liabilities:
Derivative liabilities	0	18
Fair Value, Measurements, Recurring | Interest Rate Contract | Cash Flow Hedging
Liabilities:
Derivative liabilities	9	16
Fair Value, Measurements, Recurring | Level 1
Assets:
Equity securities	164	54
Total assets	164	54
Liabilities:
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Derivatives | Cash Flow Hedging
Liabilities:
Derivative liabilities	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
Fair Value, Measurements, Recurring | Level 1 | Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate Contract | Cash Flow Hedging
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 2
Assets:
Equity securities	0	0
Total assets	91	122
Liabilities:
Total liabilities	22	37
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Derivatives | Cash Flow Hedging
Liabilities:
Derivative liabilities	0	3
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives
Assets:
Derivative assets	73	0
Liabilities:
Derivative liabilities	13	0
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	18	24
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	98
Liabilities:
Derivative liabilities	0	18
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Contract | Cash Flow Hedging
Liabilities:
Derivative liabilities	9	16
Fair Value, Measurements, Recurring | Level 3
Assets:
Equity securities	116	123
Total assets	116	123
Liabilities:
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Derivatives | Cash Flow Hedging
Liabilities:
Derivative liabilities	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
Fair Value, Measurements, Recurring | Level 3 | Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Interest Rate Contract | Cash Flow Hedging
Liabilities:
Derivative liabilities	$ 0	$ 0