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Pension And Other Postretirement Benefits (Fair Value Of Benefit Plan Assets- U.S. Pension) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Benefits - U.S. [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Insurance contracts at contract value $ 23 $ 23  
Fair value of plan assets 10,656 10,835 10,277
Pension Benefits - U.S. [Member] | U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,247 2,648  
Pension Benefits - U.S. [Member] | Non-U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,636 3,530  
Pension Benefits - U.S. [Member] | Private Equity [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 458 408  
Pension Benefits - U.S. [Member] | Corporate Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,728 1,152  
Pension Benefits - U.S. [Member] | Government Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,482 2,847  
Pension Benefits - U.S. [Member] | Asset-Backed Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11 31  
Pension Benefits - U.S. [Member] | Private Mortgages Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   128  
Pension Benefits - U.S. [Member] | Cash [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71 68  
Pension Benefits - U.S. [Member] | Total At Fair Value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,633 10,812  
Pension Benefits - U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   68  
Pension Benefits - U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Total At Fair Value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   68  
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,247 [1] 2,648 [1]  
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non-U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,636 [1] 3,530 [1]  
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,728 [2] 1,152 [2]  
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Government Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,482 [2] 2,847 [2]  
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11 [2] 31 [2]  
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71 [3]    
Pension Benefits - U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Total At Fair Value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,175 10,208  
Pension Benefits - U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Equity [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 458 [4] 408 [4]  
Pension Benefits - U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Mortgages Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   128 [5]  
Pension Benefits - U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Total At Fair Value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 458 536  
Pension Benefits - Non-U.S. [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Insurance contracts at contract value 152 158  
Fair value of plan assets 17,117 16,765 15,401
Pension Benefits - Non-U.S. [Member] | U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,589 2,443  
Pension Benefits - Non-U.S. [Member] | Non-U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,029 6,730  
Pension Benefits - Non-U.S. [Member] | Private Equity [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 393 315  
Pension Benefits - Non-U.S. [Member] | Corporate Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,859 1,631  
Pension Benefits - Non-U.S. [Member] | Government Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6,503 4,855  
Pension Benefits - Non-U.S. [Member] | Asset-Backed Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 102 98  
Pension Benefits - Non-U.S. [Member] | Private Mortgages Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 4  
Pension Benefits - Non-U.S. [Member] | Real Estate Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 397 417  
Pension Benefits - Non-U.S. [Member] | Cash [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 89 114  
Pension Benefits - Non-U.S. [Member] | Total At Fair Value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 16,965 16,607  
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Non-U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 194 [6] 228 [6]  
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Corporate Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 [7] 2 [7]  
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Government Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 186 [7] 146 [7]  
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76 63  
Pension Benefits - Non-U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Total At Fair Value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 458 439  
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,589 [1] 2,443 [1]  
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non-U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,835 [1] 6,502 [1]  
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,857 [2] 1,629 [2]  
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Government Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6,317 [2] 4,709 [2]  
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 102 [2] 98 [2]  
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 [8] 51 [8]  
Pension Benefits - Non-U.S. [Member] | Significant Other Observable Inputs (Level 2) [Member] | Total At Fair Value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15,713 15,432  
Pension Benefits - Non-U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Equity [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 393 [4] 315 [4]  
Pension Benefits - Non-U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Mortgages Debt Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 [5] 4 [5]  
Pension Benefits - Non-U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Real Estate Funds [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 397 [9] 417 [9]  
Pension Benefits - Non-U.S. [Member] | Significant Unobservable Inputs (Level 3) [Member] | Total At Fair Value [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 794 $ 736  
[1] For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.
[2] For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.
[3] For cash balances held in the form of short-term fund units that are redeemable at the measurement date, the fair value is treated as a Level 2 input.
[4] For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.
[5] For private mortgages, fair value is based on proprietary credit spread matrices developed using market data and monthly surveys of active mortgage bankers.
[6] For non-U.S. equity securities held in separate accounts, fair value is based on observable quoted prices on active exchanges.
[7] For corporate and government debt securities that are traded on active exchanges, fair value is based on observable quoted prices.
[8] For cash balances that are subject to withdrawal penalties or other adjustments, the fair value is treated as a Level 2 input.
[9] For real estate funds, fair value is based on appraised values developed using comparable market transactions.