Dividends Declared (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Dividends [Line Items]
Declaration Date	Dec. 02, 2015	Sep. 15, 2015	Dec. 03, 2014	Sep. 16, 2014
Dividend Per Share	$ 0.36	$ 0.36	$ 0.31	$ 0.31	$ 0.72	$ 0.62
Record Date	Feb. 18, 2016	Nov. 19, 2015	Feb. 19, 2015	Nov. 20, 2014
Total Amount	$ 2,853	$ 2,868	$ 2,532	$ 2,547
Payment Date	Mar. 10, 2016	Dec. 10, 2015	Mar. 12, 2015	Dec. 11, 2014