v3.26.1
Fair Value - Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Available-for-Sale Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 341 $ 427
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (8) (19)
Net transfers 0 0
Total gains (losses) realized & unrealized (2) (3)
Ending Balance 331 405
Mortgage Loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 388 399
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (13) (16)
Net transfers 27 (2)
Total gains (losses) realized & unrealized (1) 7
Ending Balance 401 388
Net Derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 65 39
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (9) 1
Net transfers 0 0
Total gains (losses) realized & unrealized (2) (5)
Ending Balance 54 35
Long-term Debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (347) (353)
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 3 4
Net transfers (1) 0
Total gains (losses) realized & unrealized (8) (15)
Ending Balance (353) (364)
Mortgage-related securities | Trading Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 27 28
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Net transfers 0 (3)
Total gains (losses) realized & unrealized (1) 1
Ending Balance $ 26 $ 26