Commitments (Details 1) $ in Millions	May 31, 2016 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2017	$ 2,447
2018	2,171
2019	1,827
2020	1,813
2021	1,596
Thereafter	4,348
Total	14,202
Aircraft And Related Equipment Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
2017	1,212
2018	1,770
2019	1,563
2020	1,620
2021	1,476
Thereafter	4,240
Total	11,881
Other [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
2017	1,235	[1]
2018	401	[1]
2019	264	[1]
2020	193	[1]
2021	120	[1]
Thereafter	108	[1]
Total	$ 2,321	[1]

[1] Primarily equipment, advertising contracts and, in 2017, approximately $615 million of estimated required quarterly contributions to our U.S. Pension Plans.