Common and Preferred Shares - Common Shares (Details) - shares shares in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Equity [Abstract] | |||
| Common shares, authorized (in shares) | 3,600 | 3,600 | 3,600 |
| Schedule Of Stock By Class [Roll Forward] | |||
| Shares issued and outstanding at beginning of year (in shares) | 702 | 723 | 743 |
| Repurchases of common shares (in shares) | (17) | (24) | (22) |
| Net shares issued for RSUs and stock option exercises (in shares) | 2 | 3 | 2 |
| Shares issued and outstanding as of December 31 (in shares) | 686 | 702 | 723 |
| Shares reserved for issuance under employee stock and employee benefit plans (in shares) | 25 | ||