Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Assets:
Equity securities	$ 179	$ 187
Fair Value, Measurements, Recurring [Member]
Assets:
Equity securities	179	187
Total assets	333	345
Liabilities:
Mandatorily redeemable noncontrolling interests	0	11
Total liabilities	32	49
Fair Value, Measurements, Recurring [Member] \| Foreign Currency Derivatives [Member] \| Cash Flow Hedging [Member]
Assets:
Derivative assets	4	1
Fair Value, Measurements, Recurring [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Fair Value Hedging [Member]
Assets:
Derivative assets	30	29
Fair Value, Measurements, Recurring [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	0	12
Fair Value, Measurements, Recurring [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Cash Flow Hedging [Member]
Assets:
Derivative assets	120	116
Liabilities:
Derivative liabilities	17	18
Fair Value, Measurements, Recurring [Member] \| Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Liabilities:
Derivative liabilities	15	20
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets:
Equity securities	54	74
Total assets	54	74
Liabilities:
Mandatorily redeemable noncontrolling interests	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Foreign Currency Derivatives [Member] \| Cash Flow Hedging [Member]
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Fair Value Hedging [Member]
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Cash Flow Hedging [Member]
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Assets:
Equity securities	0	0
Total assets	154	158
Liabilities:
Mandatorily redeemable noncontrolling interests	0	0
Total liabilities	32	38
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Foreign Currency Derivatives [Member] \| Cash Flow Hedging [Member]
Assets:
Derivative assets	4	1
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Fair Value Hedging [Member]
Assets:
Derivative assets	30	29
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	0	12
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Cash Flow Hedging [Member]
Assets:
Derivative assets	120	116
Liabilities:
Derivative liabilities	17	18
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Liabilities:
Derivative liabilities	15	20
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Assets:
Equity securities	125	113
Total assets	125	113
Liabilities:
Mandatorily redeemable noncontrolling interests	0	11
Total liabilities	0	11
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Foreign Currency Derivatives [Member] \| Cash Flow Hedging [Member]
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Fair Value Hedging [Member]
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Cross Currency Interest Rate Derivatives [Member] \| Cash Flow Hedging [Member]
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Liabilities:
Derivative liabilities	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value of financial and nonfinancial obligations.

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Fair value portion of shares that an entity is required to redeem for cash or other assets at a fixed or determinable date or upon the occurrence of an event.

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