Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Sep. 30, 2018	Jun. 30, 2018
Assets:
Equity securities	[1]	$ 226	$ 220
Total assets		354	211
Liabilities:
Mandatorily redeemable noncontrolling interests		12	12
Total liabilities		41	44
Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets		4	3
Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets		22	29
Cross Currency Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets		11	10
Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets		91	76
Liabilities:
Cross currency interest rate derivatives - cash flow hedges		11	12
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Cross currency interest rate derivatives - cash flow hedges		18	20
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Equity securities	[1]	111	93
Total assets		111	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:
Cross currency interest rate derivatives - cash flow hedges		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Cross currency interest rate derivatives - cash flow hedges		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Equity securities	[1]	0	0
Total assets		128	118
Liabilities:
Mandatorily redeemable noncontrolling interests		0	0
Total liabilities		29	32
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets		4	3
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets		22	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		11	10
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets		91	76
Liabilities:
Cross currency interest rate derivatives - cash flow hedges		11	12
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Cross currency interest rate derivatives - cash flow hedges		18	20
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Equity securities	[1]	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:
Cross currency interest rate derivatives - cash flow hedges		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Cross currency interest rate derivatives - cash flow hedges		$ 0	$ 0

[1] See Note 5 -Investments.