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Stock Plans - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Restricted And Deferred Stock
May 21, 2014
Amended 2005 Plan
Sep. 30, 2014
Amended 2005 Plan
May 21, 2014
Amended 2005 Plan
Feb. 28, 2014
Annual Equity Program
Feb. 28, 2014
Annual Equity Program
Restricted And Deferred Stock
Sep. 30, 2014
Off Cycle
Sep. 30, 2014
Off Cycle
Restricted And Deferred Stock
Jan. 31, 2014
Long-Term Incentive Plan
Restricted And Deferred Stock
Dec. 31, 2013
Common Class A
Sep. 30, 2014
Common Class A
Dec. 31, 2013
Common Class A
Dec. 03, 2013
Common Class A
Accelerated Share Repurchase Program
May 31, 2014
Common Class A
Accelerated Share Repurchase Program
May 31, 2014
Common Class A
Accelerated Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Additional number of shares available for issuance under stock option plan         75.7                          
Shares authorized to be issued under stock option plan             243.7                      
Shares available to be granted           90.7                        
Stock options granted to eligible employees 10.0             9.9   0.1                
Stock options granted to eligible employees, exercise price $ 34.18             $ 34.17   $ 35.20                
Stock options granted to eligible employees, options exercised 6.5                                  
Intrinsic value of stock options exercised $ 98,400,000                                  
Granted shares       4.0         2.0   0.8 1.2            
Granted shares fair value, per share       $ 34.08         $ 34.17   $ 32.62 $ 34.97            
Number of restricted and deferred shares of stock vested       4.0                            
Market value of vested restricted and deferred stock       137,600,000                            
Stock repurchase value                         7,700,000,000   7,700,000,000      
Number of shares repurchased                           34.3 82.8 44.8 5.1 49.9
Cost of shares repurchased 1,212,000,000   2,900,000,000                     1,200,000,000 2,700,000,000 1,500,000,000 200,000,000  
Payment for repurchase of common stock 1,020,000,000 793,000,000                     200,000,000 1,000,000,000   1,700,000,000    
Average cost of shares repurchased                           $ 35.33 $ 33.09      
Stock repurchase remaining amount                           3,800,000,000        
Additional paid in capital treasury stock                               $ 200,000,000 $ 200,000,000  
Accelerated share repurchases, average repurchase price per share                                   $ 34.10