Share-Based Compensation - Summary of Share Based Compensation Expense (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Disclosure Of Share Based Compensation Expense [Line Items] | ||
| Share-based compensation expense | $ 76 | $ 64 |
| Stock Options [Member] | ||
| Disclosure Of Share Based Compensation Expense [Line Items] | ||
| Share-based compensation expense | 6 | 7 |
| TSRUs [Member] | ||
| Disclosure Of Share Based Compensation Expense [Line Items] | ||
| Share-based compensation expense | 39 | 40 |
| PRSUs [Member] | ||
| Disclosure Of Share Based Compensation Expense [Line Items] | ||
| Share-based compensation expense | 26 | 13 |
| Employee Stock Purchase Plan [member] | ||
| Disclosure Of Share Based Compensation Expense [Line Items] | ||
| Share-based compensation expense | $ 5 | $ 4 |