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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 30 $ 29 $ 55 $ 54  
Deferred compensation costs related to unvested awards $ 175   $ 175   $ 114
Remaining shares authorized 24.0   24.0    
RSUs and Performance-based RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, weighted average grant-date fair value (in USD per share)     $ 79    
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted to certain officers, key employees and, for SARS, directors (in shares)     1.3    
Stock awards, vesting period     4 years    
Stock awards, period of service after grant date     1 year    
Stock awards, percentage of award vesting and becoming exercisable annually     25.00%    
Performance-based RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted to certain officers, key employees and, for SARS, directors (in shares)     0.1    
Stock awards, vesting period     3 years    
Stock Appreciation Rights          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted to certain officers, key employees and, for SARS, directors (in shares)     0.3    
Stock awards, percentage of award vesting and becoming exercisable annually     25.00%    
Stock awards, weighted average grant-date fair value (in USD per share)     $ 26    
Stock awards, weighted average exercise price (in USD per share)     $ 83    
Employee stock option and the SAR Program          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, vesting period     4 years    
Stock awards, expiration     10 years    
Remaining shares authorized 6.0   6.0