Dividends Declared (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Dividends [Line Items]
Declaration Date	Jun. 13, 2017	Mar. 14, 2017	Nov. 30, 2016	Sep. 20, 2016	Jun. 14, 2016	Mar. 15, 2016	Dec. 02, 2015	Sep. 15, 2015
Dividend Per Share	$ 0.39	$ 0.39	$ 0.39	$ 0.39	$ 0.36	$ 0.36	$ 0.36	$ 0.36	$ 1.56	$ 1.44	$ 1.24
Record Date	Aug. 17, 2017	May 18, 2017	Feb. 16, 2017	Nov. 17, 2016	Aug. 18, 2016	May 19, 2016	Feb. 18, 2016	Nov. 19, 2015
Total Amount	$ 3,006	$ 3,009	$ 3,012	$ 3,024	$ 2,800	$ 2,821	$ 2,842	$ 2,868
Payment Date	Sep. 14, 2017	Jun. 08, 2017	Mar. 09, 2017	Dec. 08, 2016	Sep. 08, 2016	Jun. 09, 2016	Mar. 10, 2016	Dec. 10, 2015