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Other Commitments And Contingencies (Leases) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]      
Deferred Rent Credit, Noncurrent $ 114 $ 128  
Total rent expense 155 158 $ 159
2015 98    
2016 83    
2017 72    
2018 61    
2019 56    
Beyond 2019 350    
Other Current Liabilities [Member]      
Operating Leased Assets [Line Items]      
Deferred Gain on Sale of Property $ 7 $ 7