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Segments: (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenue        
Revenue $ 24,924 $ 25,783 [1] $ 48,332 $ 50,456
Total reportable segments
       
Revenue        
Revenue 26,737 27,529 51,922 53,991
Internal transactions
       
Revenue        
Revenue 1,928 1,921 3,847 3,872
Other revenue adjustments
       
Revenue        
Revenue $ 115 $ 175 $ 257 $ 336
[1] Amounts may not add due to rounding.