Dividends Declared (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Declaration Date	Mar. 12, 2018	Nov. 29, 2017	Sep. 19, 2017	Mar. 14, 2017	Nov. 30, 2016	Sep. 20, 2016
Dividend Per Share	$ 0.42	$ 0.42	$ 0.42	$ 0.39	$ 0.39	$ 0.39	$ 1.26	$ 1.17
Record Date	May 17, 2018	Feb. 15, 2018	Nov. 16, 2017	May 18, 2017	Feb. 16, 2017	Nov. 17, 2016
Amount	$ 3,230	$ 3,232	$ 3,238	$ 3,009	$ 3,012	$ 3,024
Payment Date	Jun. 14, 2018	Mar. 08, 2018	Dec. 14, 2017	Jun. 08, 2017	Mar. 09, 2017	Dec. 08, 2016