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Share-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Nov. 30, 2020
d
$ / shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
Jun. 30, 2022
Sep. 30, 2022
USD ($)
Target
shares
Sep. 30, 2021
USD ($)
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   6,000,000,000
Compensation expense | $   $ 4 $ 5   $ 13 $ 15  
Unrecognized compensation costs related to unvested awards | $   $ 21     $ 21    
Unrecognized compensation costs related to unvested awards, weighted-average period         0 years    
Total fair value of shares vested | $         $ 7 $ 18  
2017 Employee Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares of common stock reserved for future issuance   2,315,269     2,315,269    
2017 Employee Plan [Member] | Maximum [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock, authorized shares   8,000,000     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   407,210     407,210    
2017 Director Plan [Member] | Maximum [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock, authorized shares   950,000     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     $ 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