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+ Details

SEGMENT INFORMATION - Schedule of Revenue by Service Type and Geographic Information (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		4 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Revenues From External Customers And Long Lived Assets [Line Items]
Total Revenue	$ 839	$ 745	$ 2,442	$ 2,259	$ 3,281	$ 3,004
Priority
Revenues From External Customers And Long Lived Assets [Line Items]
Total Revenue			1,567	1,430	2,096	1,901
Economy
Revenues From External Customers And Long Lived Assets [Line Items]
Total Revenue			783	730	1,061	972
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Total Revenue			$ 92	$ 99	$ 124	$ 131