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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 935 $ 606 $ 271
Other comprehensive income, net of tax:      
Change in unrealized (loss) gain on derivatives designated as cash flow hedges (9) (2) 10
Change in postretirement plan costs (30) (18) 11
Total other comprehensive (loss) income, net of tax (39) (20) 21
Comprehensive income 896 586 292
Comprehensive loss attributable to non-controlling interest 0 0 1
Comprehensive income attributable to common stockholders $ 896 $ 586 $ 293