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 | ||