Share Repurchases (Detail) - USD ($) shares in Millions, $ 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, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Share Repurchases [Line Items] | |||||||||||||||
| Shares of common stock repurchased | 170 | 294 | 295 | ||||||||||||
| Value of common stock repurchased | $ 10,283 | $ 14,800 | $ 13,209 | ||||||||||||
| Share Repurchase Program 2013 | |||||||||||||||
| Share Repurchases [Line Items] | |||||||||||||||
| Shares of common stock repurchased | 59 | 63 | 70 | 69 | 66 | 89 | 93 | 116 | 43 | 43 | |||||
| Value of common stock repurchased | $ 3,533 | $ 3,550 | $ 3,600 | $ 3,600 | $ 3,600 | $ 4,000 | $ 4,209 | $ 5,000 | $ 2,000 | $ 2,000 | |||||
| Share Repurchase Program 2016 | |||||||||||||||
| Share Repurchases [Line Items] | |||||||||||||||
| Shares of common stock repurchased | 23 | 25 | |||||||||||||
| Value of common stock repurchased | $ 1,600 | $ 1,600 | |||||||||||||