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Goodwill And Other Intangibles (Changes In The Carrying Amount Of Goodwill) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Goodwill [Roll Forward]    
Balance as of January 1, as reported $ 6,562 $ 6,420
Goodwill acquired 126 88
Other adjustments (9) [1] 31 [1]
Balance at March 31 $ 6,679 $ 6,539
[1] .