Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Narrative) (Details)

v3.7.0.1
Earnings Per Share (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stock repurchase plan, authorized amount $ 700,000,000  
Aggregate shares repurchased under stock repurchase plan (in shares) 21,609,092  
Stock purchase value $ 559,522,000  
Stock Repurchased During Period, Shares 616,152  
Stock Repurchased During Period, Value $ 33,000,000  
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 760,003 425,248
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 42,524 98,648