Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Assets:
Equity securities	$ 177	$ 187
Fair Value, Measurements, Recurring
Assets:
Equity securities	177	187
Total assets	299	345
Liabilities:
Mandatorily redeemable noncontrolling interests	0	11
Total liabilities	37	49
Fair Value, Measurements, Recurring | Foreign Currency Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	1
Liabilities:
Derivative liabilities	3	0
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	24	29
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives | Not Designated as Hedging Instrument, Economic Hedge
Assets:
Derivative assets	0	12
Fair Value, Measurements, Recurring | Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Assets:
Derivative assets	98	116
Liabilities:
Derivative liabilities	18	18
Fair Value, Measurements, Recurring | Interest Rate Contract | Cash Flow Hedging
Liabilities:
Derivative liabilities	16	20
Fair Value, Measurements, Recurring | Level 1
Assets:
Equity securities	54	74
Total assets	54	74
Liabilities:
Mandatorily redeemable noncontrolling interests	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Derivatives | Cash Flow Hedging
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 | Not Designated as Hedging Instrument, Economic Hedge
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	122	158
Liabilities:
Mandatorily redeemable noncontrolling interests	0	0
Total liabilities	37	38
Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Derivatives | Cash Flow Hedging
Assets:
Derivative assets	0	1
Liabilities:
Derivative liabilities	3	0
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives | Fair Value Hedging
Assets:
Derivative assets	24	29
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives | Not Designated as Hedging Instrument, Economic Hedge
Assets:
Derivative assets	0	12
Fair Value, Measurements, Recurring | Level 2 | Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Assets:
Derivative assets	98	116
Liabilities:
Derivative liabilities	18	18
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Contract | Cash Flow Hedging
Liabilities:
Derivative liabilities	16	20
Fair Value, Measurements, Recurring | Level 3
Assets:
Equity securities	123	113
Total assets	123	113
Liabilities:
Mandatorily redeemable noncontrolling interests	0	11
Total liabilities	0	11
Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Derivatives | Cash Flow Hedging
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 | Not Designated as Hedging Instrument, Economic Hedge
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