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Stock Plans - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Common Class A
Dec. 31, 2013
Common Class A
Dec. 03, 2013
Common Class A
Accelerated Share Repurchases
Mar. 31, 2014
Restricted And Deferred Stock
Feb. 28, 2014
Annual Equity Program
Feb. 28, 2014
Annual Equity Program
Restricted And Deferred Stock
Mar. 31, 2014
Off Cycle
Jan. 31, 2014
Long-Term Incentive Plan
Restricted And Deferred Stock
Mar. 31, 2014
2011 Long-Term Incentive Plan
Restricted And Deferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock options granted to eligible employees 10.0           9.9   0.1    
Stock options granted to eligible employees, exercise price $ 34.17           $ 34.17   $ 34.44    
Stock options granted to eligible employees, options exercised 2.5                    
Intrinsic value of stock options exercised $ 33,100,000                    
Granted shares           3.8   2.0   1.2 0.6
Granted shares fair value, per share           $ 34.00   $ 34.17   $ 34.97 $ 31.63
Number of restricted and deferred shares of stock vested           3.8          
Market value of vested restricted and deferred stock           131,400,000          
Stock repurchase value       7,700,000,000              
Number of shares repurchased     14.4   44.8            
Cost of shares repurchased 492,000,000 2,900,000,000 492,000,000   1,500,000,000            
Average cost of shares repurchased     $ 34.20                
Stock repurchase remaining amount     4,500,000,000                
Payments for shares repurchased 468,000,000   468,000,000   1,700,000,000            
Additional paid in capital treasury stock         $ 200,000,000