PARENT COMPANY CONDENSED FINANCIAL INFORMATION, Condensed Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Current Assets:
Cash and cash equivalents	$ 22	$ 14	$ 16	$ 19
Accounts and other receivables, net	173	165
Inventories	40	35
Real estate held for sale	3	8
Prepaid expenses and other	32	33
Total current assets	275	264
Investments:
Subsidiaries consolidated, at equity	347	329
Property, at Cost	2,962	2,901
Less accumulated depreciation and amortization	1,328	1,250
Property - net	1,634	1,651
Other Assets	144	126
Total	2,544.0	2,495.0	2,379.0
Current Liabilities:
Accounts payable	156	137
Other	42	50
Total current liabilities	278	353
Long-term Debt	507	386
Other Long-term Liabilities	50	54
Deferred Income Taxes	418	431
Shareholders' Equity:
Capital stock	34	34
Additional capital	239	223
Accumulated other comprehensive loss	(92)	(82)	(81)
Retained earnings	953	972
Cost of treasury stock	(11)	(11)
Total shareholders' equity	1,123	1,136	1,085	1,072
Total	2,544	2,495
A&B (Parent Company) [Member]
Current Assets:
Cash and cash equivalents	1	0	1	0
Accounts and other receivables, net	3	5
Inventories	24	16
Real estate held for sale	0	3
Prepaid expenses and other	5	6
Total current assets	33	30
Investments:
Subsidiaries consolidated, at equity	1,313	1,299
Property, at Cost	518	501
Less accumulated depreciation and amortization	237	225
Property - net	281	276
Other Assets	16	17
Total	1,643.0	1,622.0
Current Liabilities:
Current portion of long-term debt	34	108
Accounts payable	6	8
Income taxes payable	22	2
Non-qualified benefit plans	1	1
Other	17	17
Total current liabilities	80	136
Long-term Debt	308	230
Employee Benefit Plans	41	27
Non-qualified Benefit Plans	8	10
Other Long-term Liabilities	19	11
Deferred Income Taxes	50	50
Due to Subsidiaries	14	22
Shareholders' Equity:
Capital stock	34	34
Additional capital	239	223
Accumulated other comprehensive loss	(92)	(82)
Retained earnings	953	972
Cost of treasury stock	(11)	(11)
Total shareholders' equity	1,123	1,136
Total	$ 1,643	$ 1,622