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Stock-based Compensation Plans - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Intrinsic value of stock options outstanding $ 0      
Intrinsic value of stock options exercisable 0      
Total intrinsic value of options exercised 15,000,000 $ 26,000,000 $ 45,000,000  
Total unrecognized compensation cost related to nonvested stock-based compensation arrangements 418,000,000      
Expected to be recognized in 2019 238,000,000      
Expected to be recognized in 2020 139,000,000      
Expected to be recognized in 2021 35,000,000      
Expected to be recognized in 2022 $ 6,000,000      
Future Grants Shares 45,000,000      
Employee Stock Option        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock option maximum term 10 years      
Stock options vesting period Four or Five Years      
Weighted-average remaining contractual life of stock options exercisable, in years 4 years 1 month 6 days      
Performance Shares        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance period to determine shares earned 3 years      
Performance shares outstanding 1,900,000      
Performance Shares | Achievement Exceeds Predefined Target | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance shares to be awarded as a percentage of total target award 250.00%      
Performance Shares | Achievement Falls Below Threshold        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance shares to be awarded 0      
Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance shares to be awarded 3,204,000 2,495,000 1,678,000  
Performance shares outstanding 6,951,000 5,428,000 5,112,000 3,571,000
Restricted stock awards, vesting period 3 years      
DSPP        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage purchase price of stock lower of stock price at beginning or end of plan period at specified intervals 92.50%