Financial Instruments and Fair Value Measurements - Summary of Equity Securities Classified as Level 3 (Detail) - Level 3 [Member] $ in Millions	6 Months Ended
	Dec. 31, 2018 USD ($)
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance—beginning of period	$ 127
Purchases	6
Sales	(10)
Foreign exchange and other	(8)
Balance—end of period	$ 115