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Commitments - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Feb. 28, 2018 USD ($) air-craft	Feb. 28, 2018 USD ($) air-craft
Other Aircraft Commitments Disclosure [Abstract]
Boeing 767F Conditional Aircraft Commitments		4
Boeing 777F Conditional Aircraft Commitments		3
Deposit and Progress Payments | $	$ 922	$ 922
B777F Aircraft from 2021 to 2020 [Member]
Other Aircraft Commitments Disclosure [Abstract]
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments	2
Aircraft expected to be delivered, earliest fiscal year	2020
Aircraft expected to be delivered, latest fiscal year	2021
B777F Aircraft from 2021 to 2019 [Member]
Other Aircraft Commitments Disclosure [Abstract]
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments	1
Aircraft expected to be delivered, earliest fiscal year	2019
Aircraft expected to be delivered, latest fiscal year	2021
B777F Aircraft from 2022 to 2020 [Member]
Other Aircraft Commitments Disclosure [Abstract]
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments	1
Aircraft expected to be delivered, earliest fiscal year	2020
Aircraft expected to be delivered, latest fiscal year	2022

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Balance of deposits and progress payments on aircraft purchases and other planned aircraft-related transactions.

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Other aircraft commitments disclosure.

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