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Other Assets - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Prepaid Expenses and Other Current Assets    
Other non-trade receivables $ 146 $ 96
Parts and supplies 103 98
Prepaid expenses 170 127
Prepaid fees for cloud-based hosting arrangements, current 28 27
Reinsurance receivable 30 30
Income taxes receivable 14 124
Other 9 9
Total $ 500 $ 511