Supplemental Information (Contract Liabilities) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Contract with Customer, Liability [Roll Forward] | |||
| Contract liabilities, beginning balance | $ 147 | $ 62 | |
| Revenues recognized that were included in the contract liability balances at the beginning of the period | (6) | (4) | |
| Increases due to cash received and due, excluding amounts recognized as revenues during the period | 15 | 91 | |
| Contract liabilities, ending balance | $ 149 | $ 156 | $ 149 |
| Advance payment representing fixed portion of total transaction price | $ 70 | ||