Commitments - Schedule of Purchase Commitments (Details) $ in Millions	Nov. 30, 2017 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2018 (remainder)	$ 1,339
2019	2,402
2020	2,490
2021	1,874
2022	1,686
Thereafter	3,833
Total	13,624
Aircraft And Related Equipment Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
2018 (remainder)	870
2019	1,723
2020	1,965
2021	1,488
2022	1,451
Thereafter	3,334
Total	10,831
Other Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
2018 (remainder)	469	[1]
2019	679	[1]
2020	525	[1]
2021	386	[1]
2022	235	[1]
Thereafter	499	[1]
Total	$ 2,793	[1]

[1] Primarily equipment and advertising contracts.