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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
9 Months Ended
Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
 
Restricted Stock Unit Activity  
Restricted stock units outstanding, beginning of period 39
Awarded and assumed 13
Vested (14)
Forfeited (3)
Restricted stock units outstanding, end of period 35
Weighted average grant date fair value for restricted stock units awarded, during period $ 55.50