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Pension And Other Postretirement Benefits (Schedule Of Reconciliation Of Activity For Investments) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Financial Instruments [Member]
    
Balance at beginning of year $ 779 $ 831
Unrealized gains (35) (19)
Balance at end of year 618 779
Pension And Other Postretirement Benefit Plans' Assets [Member]
    
Balance at beginning of year 1,499 920
Realized gains 67 35
Unrealized gains 100 130
Purchases 1,221 497
Sales (124) (87)
Issuances      
Settlements      
Foreign currency translation impact (3) 4
Transfers in and (or) out of Level 3    [1]    [1]
Balance at end of year $ 2,760 $ 1,499
[1] In 2011 and 2010, there were no transfers of financial instruments into or out of Level 3