Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Narrative) (Details)

v2.4.0.6
Earnings Per Share (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock repurchase plan, authorized amount     500,000,000  
Aggregate shares repurchased under stock repurchase plan (in shares)     9,593,278  
Stock purchase value     441,443,000  
Stock Repurchased During Period, Value     206,000 19,325,000
Stock Options And Service-Based Restricted Stock Units [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of earnings per share, number of shares 923,275 515,712 932,362 364,811
Performance-Based Restricted Stock Units [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of earnings per share, number of shares 40,304 38,606 38,259 33,047