Commitments (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	Jun. 14, 2013 Subsequent Event [Member]
Other Commitment Disclosures [Abstract]
Deposit and Progress Payments	$ 414
Required U.S. pension plans contributions in 2014	$ 650
Other Aircraft Disclosures [Line Items]
Boeing 777F Conditional Aircraft Commitments	9
Boeing 767F Conditional Aircraft Commitments	4
Boeing 757 Aircraft Purchases	14	13
Boeing 767F Aircraft Purchases	23
Boeing 757F Aircraft Options Purchased	16
Boeing 777F deferrals	2