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Stock-Based Plans Restricted Stock Units (Details) (Restricted Stock Units (RSUs) [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
 
Restricted Stock Unit Activity  
Restricted stock units outstanding, beginning of period 34
Awarded and assumed 3
Vested (5)
Forfeited (1)
Restricted stock units outstanding, end of period 31
Weighted average grant date fair value for restricted stock units awarded, during period $ 55.47