Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Jun. 30, 2018
Assets:
Equity securities	$ 181	$ 93
Total assets	329	211
Liabilities:
Mandatorily redeemable noncontrolling interests	12	12
Total liabilities	42	44
Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	5	3
Cross Currency Interest Rate Derivatives [Member]
Liabilities:
Derivative liabilities	12	12
Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets	26	29
Cross Currency Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	12	10
Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	105	76
Interest Rate Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Derivative liabilities	18	20
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Equity securities	66	93
Total assets	66	93
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	148	118
Liabilities:
Mandatorily redeemable noncontrolling interests	0	0
Total liabilities	30	32
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	5	3
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets	26	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	12	10
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	105	76
Liabilities:
Derivative liabilities	12	12
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Derivative liabilities	18	20
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Equity securities	115	0
Total assets	115	0
Liabilities:
Mandatorily redeemable noncontrolling interests	12	12
Total liabilities	12	12
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