OTHER ASSETS AND LIABILITIES (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other Assets [Abstract]
Derivative contracts	$ 253	$ 379
Intangible assets	155	60
Non-current investments	97	97
Other	121	70
Other assets	626	606
Accrued Liabilities, Current [Abstract]
Retirement plans	110	171
Aircraft rentals	57	27
Vacation pay	248	200
Derivative contracts	85	79
Workers compensation	162	142
Other	278	201
Health	56	43
Accrued liabilities	996	863
Other Liabilities, Noncurrent [Abstract]
Postretirement obligation	107	94
Non-current leasehold interest	311	0
Construction obligation	202	86
Other	290	285
Other non-current liabilities	$ 910	$ 465