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Fair Value Measurement (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plan Target Allocation Percentage Disclosure [Line Items]      
Defined Benefit Plan Target Allocation Percentage

Retirement benefit plans 

 

The target asset allocation of the Nicor Companies Pension and Retirement Plan (Nicor Gas Retirement Plan) is approximately 60% equity and 40% fixed income. The AGL Resources Inc. Retirement Plan (AGL Retirement Plan), the Employees’ Retirement Plan of NUI Corporation (NUI Retirement Plan), the Health and Welfare Plan for Retirees and Inactive Employees of AGL Resources Inc. (AGL Postretirement Plan) target asset allocations are approximately 30% - 95% equity, 10% - 40% fixed income, 0% - 35% real estate and other and the remaining 0% - 10% in cash.

    
Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Minimum   30.00%  
Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Maximum   95.00%  
Defined Benefit Plan Target Allocation Percentage Of Assets Fixed Income Securities Range Maximum   40.00%  
Defined Benefit Plan Target Allocation Percentage Of Assets Fixed Income Securities Range Minimum   10.00%  
Defined Benefit Plan Target Allocation Percentage Of Assets Real Estate Range Minimum 0.00%    
Defined Benefit Plan Target Allocation Percentage Of Assets Real Estate Range Maximum 35.00%    
Defined Benefit Plan Target Allocation Percentage Of Assets Other Range Minimum 0.00%    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]      
Defined Benefit Plan Target Allocation Percentage

Retirement benefit plans 

 

The target asset allocation of the Nicor Companies Pension and Retirement Plan (Nicor Gas Retirement Plan) is approximately 60% equity and 40% fixed income. The AGL Resources Inc. Retirement Plan (AGL Retirement Plan), the Employees’ Retirement Plan of NUI Corporation (NUI Retirement Plan), the Health and Welfare Plan for Retirees and Inactive Employees of AGL Resources Inc. (AGL Postretirement Plan) target asset allocations are approximately 30% - 95% equity, 10% - 40% fixed income, 0% - 35% real estate and other and the remaining 0% - 10% in cash.

    
Trading Securities Fair Value Disclosure $ 59    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [RollForward]      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value 89 87 77
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 0 (4)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease 5 6  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases 6 22  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues 0 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales (9) (14)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 0  
International Companies [Member]
      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [RollForward]      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value 0 0 5
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3   (4)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease 0 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases 0 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales   (1)  
Global Hedged Equity [Member]
      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [RollForward]      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value 30 35 33
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 0 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease (1) 2  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases 2 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues 0 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales (6) 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 0  
Absolute Return [Member]
      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [RollForward]      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value 34 30 26
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 0 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease 1 2  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases 3 14  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues 0 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales 0 (12)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 0  
Private Capital [Member]
      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [RollForward]      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value 25 22 13
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Period Increase Decrease 5    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases 1 8  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales (3) (1)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0    
Fair Value, Inputs, Level 1 [Member] | International Companies [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Fair Value, Inputs, Level 1 [Member] | Emerging Markets [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Fair Value, Inputs, Level 1 [Member] | Corporate bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Fair Value, Inputs, Level 1 [Member] | Global Hedged Equity [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Fair Value, Inputs, Level 1 [Member] | Private Capital [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Fair Value, Inputs, Level 2 [Member] | US Small Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Fair Value, Inputs, Level 2 [Member] | International Companies [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 10    
Fair Value, Inputs, Level 3 [Member] | Global Hedged Equity [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   35  
Pension Plans Defined Benefit [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 754 344 303
Pension Plans Defined Benefit [Member] | Corporate bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   7  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | US Large Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 95 91  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | US Small Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 53 51  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | International Companies [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Emerging Markets [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Other Government Bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Global Hedged Equity [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Absolute Return [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Private Capital [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | US Large Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 134 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | US Small Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 25 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | International Companies [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 107 43  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Emerging Markets [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 25 16  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 191 56  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Other Government Bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 28    
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Global Hedged Equity [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Absolute Return [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Private Capital [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | US Large Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | US Small Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | International Companies [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Emerging Markets [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Other Government Bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Global Hedged Equity [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 30    
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Absolute Return [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 34 30  
Pension Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Private Capital [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 25 22  
Other Postretirement Benefit Plans Defined Benefit [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 67 71 63
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 1 1  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | US Large Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | US Small Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | International Companies [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Emerging Markets [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Other Government Bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Global Hedged Equity [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Absolute Return [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Private Capital [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | US Large Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 34 36  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | US Small Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | International Companies [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 10 12  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Emerging Markets [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 15  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Other Government Bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 16    
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Global Hedged Equity [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Absolute Return [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Private Capital [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Cash And Cash Equivalents [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | US Large Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | US Small Cap [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | International Companies [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Emerging Markets [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets   0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Other Government Bonds [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Global Hedged Equity [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0 0  
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Absolute Return [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets 0    
Other Postretirement Benefit Plans Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Private Capital [Member]
      
Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward]      
Defined Benefit Plan Fair Value Of Plan Assets $ 0 $ 0