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Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) Share Repurchases (Details 2) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 16 Months Ended 22 Months Ended
Sep. 30, 2025
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Sep. 30, 2025
Dec. 11, 2024
Dec. 06, 2023
Share Repurchase [Line Items]              
Shares Repurchased   100 1,000        
December 2023 Share Repurchase Program              
Share Repurchase [Line Items]              
Amount Authorized             $ 2,500
Shares Retired         5,200    
Average Cost Per Share         $ 482.41    
2023 Repurchase Program - Completion Date September 2025            
Shares Repurchased   0 1,000        
December 2024 Share Repurchase Program              
Share Repurchase [Line Items]              
Amount Authorized           $ 3,000  
Shares Retired       900      
Average Cost Per Share       $ 581.87      
Shares Repurchased   100 0        
Stock Repurchased and Retired During Period, Value       $ 500      
Share Repurchases - Notes to Table              
Amount remaining under authorization for share repurchases   $ 2,500   $ 2,500