Commitments - Schedule of Future Minimum Lease Payments, Operating Leases (Details) $ in Millions	Aug. 31, 2017 USD ($)
Schedule of Future Minimum Operating Lease Payments [Line Items]
2018 (remainder)	$ 1,978
2019	2,315
2020	2,016
2021	1,790
2022	1,616
Thereafter	8,826
Total	18,541
Aircraft and Related Equipment [Member]
Schedule of Future Minimum Operating Lease Payments [Line Items]
2018 (remainder)	362
2019	343
2020	261
2021	203
2022	185
Thereafter	175
Total	1,529
Facilities and Other [Member]
Schedule of Future Minimum Operating Lease Payments [Line Items]
2018 (remainder)	1,616
2019	1,972
2020	1,755
2021	1,587
2022	1,431
Thereafter	8,651
Total	$ 17,012