v3.25.4
Description of Business, Accounting Policies, and Supplemental Disclosures - Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 18 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]                  
Payments to acquire convertible notes   $ 1,400   $ 1,300         $ 5,300
Cash equivalents and marketable securities   45,800       $ 45,800      
Reclassification adjustments for gains (losses) on available-for-sale debt securities, net     $ 2,300   $ 3,300 5,600 $ (7) $ (65)  
Upward adjustments relating to equity investments in private companies     $ 7,200     7,709 49 $ 40  
Equity investments in private companies   16,200       16,200 989   989
Reclassification adjustments for gains (losses) on available-for-sale debt securities           39,500      
Equity method investments   659       659 1,200   1,200
Subsequent event | Forecast                  
Schedule of Equity Method Investments [Line Items]                  
Reclassification adjustments for gains (losses) on available-for-sale debt securities, net $ 3,000                
Upward adjustments relating to equity investments in private companies $ 12,000                
Preferred Stock                  
Schedule of Equity Method Investments [Line Items]                  
Equity investments in private companies   14,800       14,800      
Fair Value, Inputs, Level 3                  
Schedule of Equity Method Investments [Line Items]                  
Cash equivalents and marketable securities             13,800   13,800
Equity Warrant | Level 2:                  
Schedule of Equity Method Investments [Line Items]                  
Fair value of warrants   $ 2,700       $ 2,700 $ 2,700   $ 2,700