v3.26.1
Segment, Geographical Area, Major Customer and Major Supplier Information (Product Sales) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]      
Net sales $ 18,434 $ 17,149 $ 16,210
Beverage packaging(1)      
Disaggregation of Revenue [Line Items]      
Net sales 10,038 8,919 7,626
Specialty      
Disaggregation of Revenue [Line Items]      
Net sales 3,959 3,911 4,062
Automotive      
Disaggregation of Revenue [Line Items]      
Net sales 3,707 3,637 3,838
Aerospace and industrial plate      
Disaggregation of Revenue [Line Items]      
Net sales $ 730 $ 682 $ 684