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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Financial Instruments |
Carrying amounts and fair values of the financial instruments | The carrying amounts and fair values of our financial instruments were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025 | ​ | December 31, 2024 |
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair |
​ |  | amount |  | value |  | amount |  | value |
Cash and cash equivalents |  | $ | 833 | ​ | $ | 833 | ​ | $ | 560 | ​ | $ | 560 | ​
Restricted cash and cash equivalents | ​ | ​ | 417 | ​ | ​ | 417 | ​ | ​ | 381 | ​ | ​ | 381 | ​
Total debt | ​ | ​ | 6,221 | ​ | ​ | 6,241 | ​ | ​ | 6,881 | ​ | ​ | 6,888 | ​

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