Supplemental Cash Flow Information (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Nov. 30, 2016 |
Nov. 30, 2015 |
|
| Supplemental Cash Flow Information [Abstract] | ||
| Interest (net of capitalized interest) | $ 232 | $ 146 |
| Income taxes | 216 | 831 |
| Income tax refunds received | (13) | (3) |
| Cash tax payments, net | $ 203 | $ 828 |