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Employee Benefit Plans (Details 1) (Restricted Stock [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Restricted Stock [Member]
 
Restricted stock unit activity  
Balance at December 31, 2011, Number of Shares 22
Balance at December 31, 2011, Weighted Average Grant-Date Fair Value per Share (usd per share) $ 32.88
Restricted stock units granted, Number of Shares 12
Restricted stock units granted, Weighted Average Grant Date Fair Value (usd per share) $ 36.07
Restricted stock units assumed, Number of Shares 6
Restricted stock units assumed, Weighted Average Grant Date Fair Value (usd per share) $ 37.54
Restricted stock units cancelled, Number of Shares (1)
Restricted stock units cancelled, Weighted Average Grant-date Fair Value per Share (usd per share) $ 34.63
Restricted stock units vested, Number of Shares (11)
Restricted stock units vested, Weighted Average Grant-Date Fair Value per Share (usd per share) $ 28.43
Balance at September 30, 2012, Number of Shares 28
Balance at September 30, 2012, Weighted Average Grant-Date Fair Value per Share (usd per share) $ 35.26