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 | |||