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Share-Based Payments - LTI Stock Option Plan Executives - Additional Information (Detail)
shares in Millions, Unit_pure in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Fair value of stock options granted | $ $ 0 $ 7.54 $ 11.79
Number of shares issued 1,972.0 1,959.0 1,957.0
Long Term Incentive Stock Option Plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Stock options granted 0.0 38.1  
Long Term Incentive Stock Option Plan [member] | Executive [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Stock options granted   3.6  
Fair value of stock options granted | $   $ 287,000,000  
Long Term Restricted Stock Unit Program One [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Stock options granted   7.0  
Share based payment vesting period 5 years    
Long Term Restricted Stock Unit Program One [member] | Executive [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Stock options granted 0.0 0.8  
Fair value of stock options granted | $   $ 307,000,000  
Long Term Restricted Stock Unit Program Three [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share based payment vesting period 5 years    
Share-based compensation grant date fair value 0.1 0.1  
Share-based compensation grant date fair value | $ $ 7,000,000 $ 6,000,000  
Long Term Restricted Stock Unit Program Four [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Stock options granted 0.8 1.7  
Fair value of stock options granted | $ $ 7,000,000 $ 120,000,000  
Restricted Stock Units [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation grant date fair value 3.9 10.9 5.5
Share-based compensation grant date fair value | $ $ 9,000,000 $ 9,000,000  
Number of shares issued 0.2 0.2  
Restricted Stock Units [member] | Management board members and other employees [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Fair value of stock options granted | $ $ 155,000,000 $ 116,000,000  
Number of shares issued 2.8 1.7  
Restricted Stock Units [member] | Board of Director [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of shares issued 0.2 0.1