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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 |

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