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Share-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2020
d
$ / shares
Mar. 31, 2022
USD ($)
Target
shares
Mar. 31, 2021
USD ($)
Dec. 31, 2021
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock, authorized shares   6,000,000,000   6,000,000,000
Compensation expense | $   $ 4 $ 6  
Unrecognized compensation costs related to unvested awards | $   $ 29    
Unrecognized compensation costs related to unvested awards, weighted-average period   2 years    
Total fair value of shares vested | $   $ 6 $ 14  
2017 Employee Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares of common stock reserved for future issuance   2,315,323    
2017 Employee Plan [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock, authorized shares   8,000,000    
2017 Director Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares of common stock reserved for future issuance   484,583    
2017 Director Plan [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock, authorized shares   950,000    
Performance Stock Units ("PSUs") [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award performance period   3 years    
Market capitalization | $   $ 1,000    
Vesting rights   zero to 200    
Performance Stock Units ("PSUs") [Member] | Special Awards [Member] | Eight Share Price Targets [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting rights One-eighth      
Consecutive trading day period | d 20      
PSUs remaining performance period forfeited 4 years      
Share price target achieved | Target   6    
Total share price targets | Target   8    
Percentage of awards granted vested   75.00%    
Performance Stock Units ("PSUs") [Member] | Maximum [Member] | Special Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting rights   200    
Average closing sales price per share, | $ / shares $ 25.00      
Performance Stock Units ("PSUs") [Member] | Minimum [Member] | Special Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Average closing sales price per share, | $ / shares $ 11.00