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Earnings Per Share and Common Stock - Reconciliation of Information Used to Compute Basic and Diluted EPS (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income $ 385 $ 332 $ 1,136 $ 841
Less: preferred stock dividends declared 1 1 2 2
Net income available to Howmet Aerospace common shareholders - basic 384 331 1,134 839
Net income available to Howmet Aerospace common shareholders - diluted $ 384 $ 331 $ 1,134 $ 839
Average shares outstanding - basic (in shares) 403 408 404 408
Effect of dilutive securities:        
Stock and performance awards (in shares) 2 2 2 3
Average shares outstanding - diluted (in shares) 405 410 406 411