OTHER ASSETS AND LIABILITIES (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Assets [Abstract]
Derivative contracts	$ 264	$ 253
Intangible assets	147	155
Non-current investments	73	97
Other	157	121
Other assets	641	626
Accrued Liabilities, Current [Abstract]
Retirement plans	104	110
Aircraft rentals	88	57
Vacation pay	253	248
Health	56	56
Derivative contracts	41	85
Workers compensation	166	162
Deferred taxes	105	68
Other	211	210
Accrued liabilities	1,024	996
Other Liabilities, Noncurrent [Abstract]
Postretirement obligation	109	107
Non-current leasehold interest	301	311
Construction obligation	239	202
Other	275	290
Other non-current liabilities	$ 924	$ 910