v3.26.1
Debt - Schedule of Carrying Amounts and Fair Values of Long-Term Fixed-Rate Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
SpaceX Notes | Carrying Amount | Level II    
Debt Instrument [Line Items]    
Long-term debt $ 24,852 $ 0
SpaceX Notes | Fair Value | Level II    
Debt Instrument [Line Items]    
Long-term debt 24,697 0
X B-3 Term Loan | Carrying Amount | Level II    
Debt Instrument [Line Items]    
Long-term debt 0 5,912
X B-3 Term Loan | Fair Value | Level II    
Debt Instrument [Line Items]    
Long-term debt 0 6,190
xAI Fixed Rate Term Loan | Carrying Amount | Level II    
Debt Instrument [Line Items]    
Long-term debt 0 991
xAI Fixed Rate Term Loan | Fair Value | Level II    
Debt Instrument [Line Items]    
Long-term debt 0 $ 1,057
xAI 12.5% Secured Senior Notes    
Debt Instrument [Line Items]    
Interest rate   12.50%
xAI 12.5% Secured Senior Notes | Carrying Amount | Level II    
Debt Instrument [Line Items]    
Long-term debt 0 $ 2,988
xAI 12.5% Secured Senior Notes | Fair Value | Level II    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 3,173