Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019
Assets:
Equity securities	$ 186	$ 187
Fair Value, Measurements, Recurring [Member]
Assets:
Equity securities	186	187
Total assets	289	345
Liabilities:
Mandatorily redeemable noncontrolling interests	0	11
Total liabilities	35	49
Fair Value, Measurements, Recurring [Member] | Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	0	1
Liabilities:
Derivative liabilities	2	0
Fair Value, Measurements, Recurring [Member] | Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets	21	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	82	116
Liabilities:
Derivative liabilities	17	18
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Derivative liabilities	16	20
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Equity securities	77	74
Total assets	77	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
Liabilities:
Derivative liabilities	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	103	158
Liabilities:
Mandatorily redeemable noncontrolling interests	0	0
Total liabilities	35	38
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	0	1
Liabilities:
Derivative liabilities	2	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets	21	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	82	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	16	20
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Equity securities	109	113
Total assets	109	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
Liabilities:
Derivative liabilities	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