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Stock Based Compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Incentive and Nonqualified Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period 3.00   1.24  
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price $ 35.61 $ 34.85 $ 34.48  
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price $ 35.81 $ 34.92 $ 33.94  
Share based Compensation Arrangement By Share based Payment Award Options Exercisable Intrinsic Value1 $ 11,000,000 $ 4,000,000 $ 6,000,000  
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term 4.5 4.9 5.3  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range End Of Period [Abstract]        
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options 1,823,154      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit $ 17.55      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit $ 43.85      
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price $ 35.81 $ 34.92 $ 33.94  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]        
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used Black-Scholes option-pricing model      
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term 7   7  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate 2.51%   2.30%  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate 14.81%   12.90%  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate 4.30%   5.50%  
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Allocated Share Based Compensation Expense 14,000,000 [1] 11,000,000 [1] 11,000,000 [1]  
Employee Service Share Based Compensation Tax Benefit From Compensation Expense 1,000,000 [1] 2,000,000 [1] 2,000,000 [1]  
Employee Service Share Based Compensation Excess Tax Benefit From Compensation Expense 1,000,000 [2] 2,000,000 [2] 2,000,000 [2]  
Employee Stock Purchase Plan Maximum Contribution 25,000      
Employee Stock Purchase Plan [Line Items]        
Stock Issued During Period Shares Employee Stock Purchase Plans 65,843 60,017 63,847  
Stock Issued Employee Stock Purchase Plan Average Price Per Share $ 40.55 $ 37.07 $ 31.45  
Stock Issued Employee Stock Purchase Plan Purchase Price Discount 401,346 333,639 298,968  
Cash received from stock option exercises 11,000,000      
Performance Cash Awards Accruals 1,000,000      
Performance Share Unit Awards Accruals 2,000,000 4,000,000    
Maximum Payout 13,000,000 12,000,000    
Aggregate Payout 4,000,000      
Income Tax benefit from stock options exercises 1,000,000      
Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights 82,222      
Unvested Stock Options [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares issuable upon exercise of outstanding stock options 75,498 429,778    
Weighted average fair value        
Outstanding $ 1.24 $ 3.11    
Issued $ 3.00      
Vested $ 3.51      
Forfeited $ 1.24      
Incentive and Nonqualified Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number 75,498 429,778    
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period 1,685      
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period (3,190)      
Share Based Compensation Arrangemen tBy Share Based Payment Award Options Vested And Expected To Vest Exercisable Number (352,775)      
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price $ 31.09 $ 34.58    
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price $ 42.19      
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price $ 31.09      
Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price $ 35.40      
Share based Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term1 0.1 0.5    
Stock Options [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares issuable upon exercise of outstanding stock options 1,823,154 2,229,112 2,551,568 2,475,989
Incentive and Nonqualified Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number 1,823,154 2,229,112 2,551,568 2,475,989
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period 1,685 0 250,440  
Stock Issued During Period Shares Stock Options Exercised (383,646) (296,008) (119,126)  
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period (23,997) (26,448) (55,735)  
Share Based Compensation Arrangemen tBy Share Based Payment Award Options Vested And Expected To Vest Exercisable Number 1,747,656 1,799,334 1,767,248  
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price       $ 34.52
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price $ 42.19   $ 31.09  
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price $ 31.11 $ 31.33 $ 27.20  
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price $ 37.70 $ 37.85 $ 36.50  
Share based Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term1 4.6 5.2    
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value 12,000,000      
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term   3.0    
Stock Awards [Member]
       
Stock and Restricted Stock Awards        
Issued 20,858      
Vested 20,858      
Weighted average fair value        
Issued $ 40.62      
Vested $ 40.62      
Restricted Stock Awards [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares issuable upon exercise of outstanding stock options 126,920      
Stock and Restricted Stock Awards        
Outstanding 477,354 [3],[4] 400,900 [3] 341,245 [3]  
Issued 311,600 205,030    
Vested (209,362) (129,222)    
Forfeited (25,784) (16,153)    
Weighted average fair value        
Outstanding $ 34.40 [3] $ 30.80 [3]    
Issued $ 39.48 $ 36.34    
Vested $ 34.68 $ 35.19    
Forfeited $ 36.22 $ 34.13    
Incentive and Nonqualified Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number 126,920      
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period 134,510      
Share based Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term1 2.6 [3],[4] 2.4 [3]    
Nicor Inc [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares authorized for future grant 1,664,133      
Options Outstanding [Member]
       
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range End Of Period [Abstract]        
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range1 6,410      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 1 21.28      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range2 10,763      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 2 23.82      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range3 84,375      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 3 26.93      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range4 443,664      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 4 32.23      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range5 1,234,766      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 5 37.41      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range6 43,176      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 6 41.09      
Options Exercisable [Member]
       
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range End Of Period [Abstract]        
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range1 6,410      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 1 21.28      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range2 10,763      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 2 23.82      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range3 84,375      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 3 26.93      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range4 368,166      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 4 32.46      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range5 1,234,766      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 5 37.41      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range6 43,176      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price 6 $ 41.09      
Omnibus Performance Incentive Plan [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares authorized for future grant 4,787,707 [5]      
Shares issuable upon exercise of outstanding stock options 866,249 [6]      
Share Based Compensation Arrangement By Share Based Payment Award Description Shares available for future issuance may be issued in the form of grants of incentive and nonqualified stock options, stock appreciation rights (SARs), shares of restricted stock, restricted stock units and performance cash awards to key employees.      
Incentive and Nonqualified Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number 866,249 [6]      
Long-Term Incentive Plan (1999) [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares authorized for future grant 0      
Shares issuable upon exercise of outstanding stock options 1,362,032 [6]      
Share Based Compensation Arrangement By Share Based Payment Award Description Plan previously provided for grants of incentive and nonqualified stock options, shares of restricted stock and performance units to key employees. No further grants will be made except for reload options that may be granted under the plan's outstanding options..      
Incentive and Nonqualified Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number 1,362,032 [6]      
Officer Incentive Plan [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares issuable upon exercise of outstanding stock options 5,000 [6]      
Share Based Compensation Arrangement By Share Based Payment Award Description Plan previously provided for grants of nonqualified stock options and shares of restricted stock to new-hire officers. No future grants will be made under this plan      
Incentive and Nonqualified Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number 5,000 [6]      
2006 Non-Employee Directors Equity Compensation Plan [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares authorized for future grant 119,954      
Share Based Compensation Arrangement By Share Based Payment Award Description Grants of stock to non-employee directors in connection with non-employee director compensation (for annual retainer, chair retainer and for initial election or appointment).      
1996 Non-Employee Directors Equity Compensation Plan [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares issuable upon exercise of outstanding stock options 7,173 [6]      
Share Based Compensation Arrangement By Share Based Payment Award Description Plan previously provided for grants of nonqualified stock options and stock to non-employee directors in connection with non-employee director compensation (for annual retainer and for initial election or appointment). The plan was amended in 2002 to eliminate the granting of stock options. No future grants will be made under this plan      
Incentive and Nonqualified Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number 7,173 [6]      
1996 Non-Employee Directors Equity Compensation Plan [Member] | Restricted Stock Awards [Member]
       
Weighted average fair value        
Outstanding     $ 33.93 [3]  
Employee Stock Purchase Plan [Member]
       
Compensation Related Costs Share Based And Other Compensation Plans Disclosure [Line Items]        
Shares authorized for future grant 332,205      
Share Based Compensation Arrangement By Share Based Payment Award Description Nonqualified, broad-based employee stock purchase plan for eligible employees.      
[1] Recorded in our Consolidated Statements of Income.
[2] Recorded in our Consolidated Statements of Cash Flows
[3] Subject to restriction.
[4] Includes 82,222 restricted shares with nonforfeitable dividend rights
[5] Includes 1,664,133 shares, previously available under the Nicor Inc. 2006 Long term incentive plan as amended that were assumed and now available under the Omnibus Performance Plan pursuant to NYSE rules.
[6] As of December 31, 2011.