Commitments (Details 4) (USD $) In Millions	Aug. 31, 2011
Schedule of Future Minimum Operating Lease Payments [Line Items]
2012 (remainder)	$ 1,428
2013	1,726
2014	1,537
2015	1,391
2016	1,224
Thereafter	6,485
Total	13,791
Aircraft and Related Equipment [Member]
Schedule of Future Minimum Operating Lease Payments [Line Items]
2012 (remainder)	418
2013	499
2014	473
2015	455
2016	458
Thereafter	1,545
Total	3,848
Facilities and Other [Member]
Schedule of Future Minimum Operating Lease Payments [Line Items]
2012 (remainder)	1,010
2013	1,227
2014	1,064
2015	936
2016	766
Thereafter	4,940
Total	$ 9,943