Indebtedness: (Credit Facilities) (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Sep. 20, 2022 |
Jan. 28, 2022 |
|
| Line of Credit Facility [Line Items] | |||
| Committed Revolving Credit Facilities | $ 6,200,000,000 | ||
| 364-day revolving credit, expiring January 28, 2025 | |||
| Line of Credit Facility [Line Items] | |||
| Debt term | 364 days | ||
| Committed Revolving Credit Facilities | $ 1,700,000,000 | ||
| Multi-year Revolving Credit Facility, Expiring February 10, 2026 | |||
| Line of Credit Facility [Line Items] | |||
| Committed Revolving Credit Facilities | 2,000,000,000.0 | ||
| Multi-year revolving credit, expiring September 29, 2026 | |||
| Line of Credit Facility [Line Items] | |||
| Committed Revolving Credit Facilities | $ 2,500,000,000 | ||
| Multi-year Revolving Credit Facility, Expiring February 10, 2027 | |||
| Line of Credit Facility [Line Items] | |||
| Committed Revolving Credit Facilities | $ 1,900,000,000 | ||
| Multi-year Revolving Credit Facility, Expiring September 29, 2027 | |||
| Line of Credit Facility [Line Items] | |||
| Committed Revolving Credit Facilities | $ 2,300,000,000 |