Dividends Declared (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Declaration Date	Jun. 13, 2018	Mar. 12, 2018	Nov. 29, 2017	Sep. 19, 2017	Jun. 13, 2017	Mar. 14, 2017	Nov. 30, 2016	Sep. 20, 2016
Dividend Per Share	$ 0.42	$ 0.42	$ 0.42	$ 0.42	$ 0.39	$ 0.39	$ 0.39	$ 0.39	$ 1.68	$ 1.56	$ 1.44
Record Date	Aug. 16, 2018	May 17, 2018	Feb. 15, 2018	Nov. 16, 2017	Aug. 17, 2017	May 18, 2017	Feb. 16, 2017	Nov. 17, 2016
Amount	$ 3,224	$ 3,226	$ 3,232	$ 3,238	$ 3,003	$ 3,009	$ 3,012	$ 3,024
Payment Date	Sep. 13, 2018	Jun. 14, 2018	Mar. 08, 2018	Dec. 14, 2017	Sep. 14, 2017	Jun. 08, 2017	Mar. 09, 2017	Dec. 08, 2016