Capital - Additional Information (Detail) shares in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2021
USD ($)
shares
|
Dec. 31, 2021
$ / shares
|
Dec. 31, 2020
USD ($)
shares
|
|
| Disclosure Of Share Capital [Line Items] | |||
| Potential repurchase of common shares | 1,400 | ||
| Other financial liabilities | $ | $ 175 | $ 376 | |
| Series ii cumulative redeemable preference share capital [member] | |||
| Disclosure Of Share Capital [Line Items] | |||
| Number of shares authorized | 6 | 6 | |
| Redemption price of shares | $ / shares | $ 25.00 | ||
| Dividend payable rate percentage | 70.00% | ||
| Pre-defined share repurchase program with broker [member] | |||
| Disclosure Of Share Capital [Line Items] | |||
| Other financial liabilities | $ | $ 200 | $ 200 | |
| NCIB [member] | |||
| Disclosure Of Share Capital [Line Items] | |||
| Potential repurchase of common shares | 20 |