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Goodwill And Other Intangibles (Changes In The Carrying Amount Of Goodwill) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Roll Forward]    
Balance as of January 1, as reported $ 6,562 $ 6,420
Goodwill acquired 226 124
Other adjustments 4 [1] 18 [1]
Balance at December 31, $ 6,792 $ 6,562
[1] Reflects increases due to the impact of foreign exchange in both years. 2012 also reflects a reduction due to purchase accounting adjustments.