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Goodwill And Other Intangibles (Changes In The Carrying Amount Of Goodwill) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Goodwill [Roll Forward]    
Balance as of January 1, as reported $ 6,792 $ 6,562
Goodwill acquired 0 89
Other adjustments (40) [1] 24 [1]
Balance at March 31 $ 6,752 $ 6,675
[1] Reflects the impact of foreign exchange in each year.