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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 175 $ 390 $ 446 $ 555
Other comprehensive loss, net of tax:        
Change in unrealized loss on derivatives designated as cash flow hedges (1) (8) (2) (10)
Change in postretirement plan costs 1 0 1 0
Total other comprehensive loss, net of tax 0 (8) (1) (10)
Comprehensive income $ 175 $ 382 $ 445 $ 545