v3.26.1
Stockholders' Equity - Changes in Stockholders Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Changes in Stockholders' Equity        
Beginning balance $ 411,065 $ 285,970 $ 305,867  
Other comprehensive income (loss) (3,362) (880)    
Net income 30,255 17,127 90,798 $ 65,944
Ending balance 441,914 305,867 441,914 305,867
Common stock        
Changes in Stockholders' Equity        
Beginning balance 112 111 111  
Stock-based compensation and issuance of employee benefit plan stock 1 0    
Ending balance 113 111 113 111
Treasury stock        
Changes in Stockholders' Equity        
Beginning balance (7,837) (7,837) (7,837)  
Ending balance (7,837) (7,837) (7,837) (7,837)
Additional paid-in capital        
Changes in Stockholders' Equity        
Beginning balance 140,024 120,864 124,514  
Stock-based compensation and issuance of employee benefit plan stock 3,955 3,650    
Ending balance 143,979 124,514 143,979 124,514
Accumulated other comprehensive income (loss)        
Changes in Stockholders' Equity        
Beginning balance 28,230 (34) (914)  
Other comprehensive income (loss) (3,362) (880)    
Ending balance 24,868 (914) 24,868 (914)
Retained earnings        
Changes in Stockholders' Equity        
Beginning balance 250,536 172,866 189,993  
Net income 30,255 17,127    
Ending balance $ 280,791 $ 189,993 $ 280,791 $ 189,993