Commitments - Schedule of Purchase Commitments (Details) $ in Millions	Nov. 30, 2018 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2019 (remainder)	$ 1,404
2020	2,754
2021	2,798
2022	2,234
2023	1,843
Thereafter	3,549
Total	14,582
Aircraft And Related Equipment Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
2019 (remainder)	832
2020	1,987
2021	2,285
2022	1,867
2023	1,577
Thereafter	3,015
Total	11,563
Other Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
2019 (remainder)	572	[1]
2020	767	[1]
2021	513	[1]
2022	367	[1]
2023	266	[1]
Thereafter	534	[1]
Total	$ 3,019	[1]

[1] Primarily equipment and advertising contracts.