INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 40	$ 43	$ 24
State and foreign	4	6	2
Current	44	49	26
Deferred:
Federal	(10)	(3)	(23)
State and foreign	(2)	(1)	2
Deferred	(12)	(4)	(21)
Total continuing operations tax expense	32	45	5
Income tax reconciliation [Abstract]
Computed federal income tax expense	30	40	4
State income taxes	2	5	4
Tax effect of HS&TC consolidation	0	0	(2)
Other-net	0	0	(1)
Total continuing operations tax expense	32	45	5
Deferred tax assets:
Benefit plans	82	77
Insurance reserves	10	10
Capitalized development costs	16	14
Other	10	6
Total deferred tax assets	118	107
Deferred tax liabilities:
Basis differences for property and equipment	293	287
Tax-deferred gains on real estate transactions	213	216
Capital Construction Fund	3	3
Joint ventures and other investments	1	7
Other	21	17
Total deferred tax liabilities	531	530
Net deferred tax liability	413	423
Net tax benefits from share-based transactions	2.0	0.6
Reconciliation of unrecognized tax benefits [Roll Forward]
Balance at beginning of period	8	8	6
Additions for tax positions of prior years	1	0	0
Additions for tax positions of current year		2	3
Reductions for tax positions of current year	(1)
Reductions for tax positions of prior years	0	(1)	0
Reductions for lapse of statute of limitations	(1)	(1)	(1)
Balance at end of period	7	8	8
Unrecognized tax benefits, that, if recognized, would impact the effective rate	$ 7	$ 8