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Goodwill and Other Intangible Assets - Changes During Period (Details 2) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Changes in the carrying amount of goodwill [Abstract]        
Balance at beginning of period $ 48,856 $ 48,359 $ 48,854 $ 48,357
Changes during the period:        
Business combinations 11 10 6 19
Dispositions 0 0 0 (19)
Other 15 (49) 22 (37)
Balance at March 31, $ 48,882 $ 48,320 $ 48,882 $ 48,320