Earnings Per Share - Reconciliation of Earnings Used for Earnings per Share Calculations (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Earnings per share [abstract] | ||
| Earnings attributable to common shareholders | $ 5,689 | $ 1,122 |
| Less: Dividends declared on preference shares | (2) | (2) |
| Earnings used in consolidated earnings per share | 5,687 | 1,120 |
| Less: (Earnings) loss from discontinued operations, net of tax | (2) | 27 |
| Earnings used in earnings per share from continuing operations | $ 5,685 | $ 1,147 |