Earnings Per Share - Reconciliation of Earnings Used for Earnings per Share Calculations (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Earnings per share [abstract] | ||||
| Earnings attributable to common shareholders | $ 448 | $ 313 | $ 907 | $ 747 |
| Less: Dividends declared on preference shares | (1) | (1) | (2) | (2) |
| Earnings used in consolidated earnings per share | 447 | 312 | 905 | 745 |
| Less: (Earnings) loss from discontinued operations, net of tax | (4) | (16) | 14 | (25) |
| Earnings used in earnings per share from continuing operations | $ 443 | $ 296 | $ 919 | $ 720 |