Statements of Capital (Parenthetical) - $ / shares |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Statement of Stockholders' Equity [Abstract] | ||||
| Cash dividends on capital stock (in dollars per share) | $ 1.84 | $ 1.84 | $ 3.76 | $ 4.17 |