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Investment In and Advances to Non-Consolidated Affiliates and Related Party Transactions (Tables)
 6 Months Ended
Sep. 30, 2024
Related Party Transactions [Abstract]  
Summary of condensed results of operations of equity method affiliates
The following table summarizes the results of operations of our equity method non-consolidated affiliates in the aggregate and the nature and amounts of significant transactions we have with our non-consolidated affiliates. The amounts in the table below are disclosed at 100% of the operating results of these affiliates.
 
Three Months Ended
September 30,
Six Months Ended
September 30,
in millions2024202320242023
Net sales$401 $394 $800 $790 
Costs and expenses related to net sales394 381 780 762 
Income tax provision
2 4 5 8 
Net income
$5 $9 $15 $20 
Purchases of tolling services from Alunorf$77 $81 $152 $158 
Period-end account balances with non-consolidated affiliates, shown as related party balances
The following table describes related party balances in the accompanying condensed consolidated balance sheets. We had no other material related party balances with non-consolidated affiliates.
in millionsSeptember 30,
2024		March 31,
2024
Accounts receivable, net — related parties
$138 $161 
Other long-term assets — related parties
5 3 
Accounts payable — related parties
292 280