{"cik":811596,"taxonomy":"us-gaap","tag":"IncreaseDecreaseInAccountsReceivable","label":"Increase (Decrease) in Accounts Receivable","description":"The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.","entityName":"KAISER ALUMINUM CORP","units":{"USD":[{"start":"2025-01-01","end":"2025-03-31","val":48000000,"accn":"0001193125-26-173882","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-04-23","frame":"CY2025Q1"},{"start":"2026-01-01","end":"2026-03-31","val":105300000,"accn":"0001193125-26-173882","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-04-23","frame":"CY2026Q1"}]}}