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Stock Plans - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 6 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2013
Common Class A
Jun. 30, 2014
Common Class A
Dec. 31, 2013
Common Class A
May 31, 2014
Common Class A
Accelerated Share Repurchase Program
Dec. 03, 2013
Common Class A
Accelerated Share Repurchase Program
May 31, 2014
Common Class A
Accelerated Share Repurchase Program
Jun. 30, 2014
Restricted And Deferred Stock
May 31, 2014
Amended 2005 Plan
Feb. 28, 2014
Annual Equity Program
Feb. 28, 2014
Annual Equity Program
Restricted And Deferred Stock
Jun. 30, 2014
Off Cycle
Jun. 30, 2014
Off Cycle
Restricted And Deferred Stock
Jan. 31, 2014
Long-Term Incentive Plan
Restricted And Deferred Stock
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                     90.1          
Stock options granted to eligible employees 10.0                     9.9   0.1    
Stock options granted to eligible employees, exercise price $ 34.16                     $ 34.17   $ 34.12    
Stock options granted to eligible employees, options exercised 5.3                              
Intrinsic value of stock options exercised $ 79,100,000                              
Granted shares                   3.9     2.0   0.7 1.2
Granted shares fair value, per share                   $ 34.05     $ 34.17   $ 32.24 $ 34.97
Number of restricted and deferred shares of stock vested                   3.9            
Market value of vested restricted and deferred stock                   135,600,000            
Stock repurchase value           7,700,000,000                    
Number of shares repurchased         26.0   5.1 44.8 49.9              
Cost of shares repurchased 720,000,000   2,900,000,000 200,000,000 900,000,000   200,000,000 1,500,000,000                
Average cost of shares repurchased         $ 35.13                      
Stock repurchase remaining amount         4,000,000,000                      
Payments for shares repurchased 720,000,000 92,000,000     700,000,000     1,700,000,000                
Additional paid in capital treasury stock             $ 200,000,000 $ 200,000,000                
Accelerated share repurchases, average repurchase price per share                 $ 34.10