Condensed Consolidated Statement of Shareholder's Equity (unaudited) (Parenthetical) - Accumulated Other Comprehensive Loss (AOCI) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Fair value of effective portion of cash flow hedges, tax provision (benefit)	$ (49)	$ 2	$ (73)	$ (7)
Pension and other benefits, tax provision (benefit)	$ 2		$ 1	$ (2)

Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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