v3.26.1
Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Long-term debt, due within one year, net of original issue discount $ 2,439  
Long-term debt, due within one year   $ 2,659
Long-term debt, due after one year 14,910 14,411
Total long-term debt 17,349 17,070
Unsecured    
Debt Instrument [Line Items]    
Long-term debt, due within one year, net of original issue discount (20)  
Long-term debt, due within one year   0
Long-term debt, due after one year 9,939 10,012
Total long-term debt 9,919 10,012
Secured debt    
Debt Instrument [Line Items]    
Long-term debt, due within one year 2,459 2,659
Long-term debt, due after one year 4,971 4,399
Total long-term debt 7,430 7,058
Federal Home Loan Bank Advances | Federal Home Loan Bank of Pittsburgh    
Debt Instrument [Line Items]    
Total long-term debt $ 4,200 $ 4,200