Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 3,935	$ 4,201	$ 12,133	$ 14,089
Cost of goods sold (exclusive of depreciation and amortization)	3,309	3,794	10,287	12,199
Selling, general and administrative expenses	189	164	545	509
Depreciation and amortization	139	133	406	405
Interest expense and amortization of debt issuance costs	73	75	228	198
Research and development expenses	24	23	72	69
Loss on extinguishment of debt, net	0	0	5	0
Restructuring and impairment expenses, net	26	5	33	7
Equity in net loss (income) of non-consolidated affiliates	6	(6)	(1)	(14)
Other (income) expenses, net	(6)	7	(35)	67
Total expenses	3,760	4,195	11,540	13,440
Income from continuing operations before income tax provision	175	6	593	649
Income tax provision (benefit)	54	(6)	159	146
Net income from continuing operations	121	12	434	503
Loss from discontinued operations, net of tax	0	0	0	(2)
Net income	121	12	434	501
Net loss attributable to noncontrolling interests	0	0	0	(1)
Net income attributable to our common shareholder	$ 121	$ 12	$ 434	$ 502