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Financial Instruments and Fair Value Measurements - Summary of Equity Securities Classified as Level 3 (Detail) - Equity Securities [Member] - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance - beginning of period $ 113 $ 127
Purchases 0 5
Sales   (10)
Foreign exchange and other (1) (7)
Balance - end of period $ 112 $ 115