Dividends Declared (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Equity [Abstract]
Declaration Date	Mar. 11, 2019	Nov. 28, 2018	Sep. 18, 2018	Mar. 12, 2018	Nov. 29, 2017	Sep. 19, 2017
Record Date	May 16, 2019	Feb. 21, 2019	Nov. 15, 2018	May 17, 2018	Feb. 15, 2018	Nov. 16, 2017
Payment Date	Jun. 13, 2019	Mar. 14, 2019	Dec. 13, 2018	Jun. 14, 2018	Mar. 08, 2018	Dec. 14, 2017
Dividend Per Share	$ 0.46	$ 0.46	$ 0.46	$ 0.42	$ 0.42	$ 0.42	$ 1.38	$ 1.26
Amount	$ 3,526	$ 3,526	$ 3,544	$ 3,226	$ 3,232	$ 3,238	$ 10,596	$ 9,696