Sale of Accounts Receivable: (Loss on Sale of Trade Receivables) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Sale of Accounts Receivable [Abstract] | ||||
| Loss on sale of trade receivables | $ 7 | $ 9 | $ 21 | $ 26 |