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SHAREHOLDERS' EQUITY, Share Repurchases Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Equity [Abstract]          
Share repurchases, authorized amount         $ 2,000
Repurchases of common stock (in shares) 2.6 3.3 7.7 5.3  
Shares repurchased $ 400   $ 1,200    
Shares repurchased (in usd per share) $ 152        
Share repurchases, remaining authorized amount $ 1,100   $ 1,100