Related Party Transactions - Summary of Key Management Personnel Compensation, Including Directors (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Related party transactions [abstract] | ||
| Salaries and other benefits | $ 45 | $ 41 |
| Share-based payments | 20 | 16 |
| Total compensation | $ 65 | $ 57 |