v3.25.4
Fair Value - Recurring Level 3 Rollforward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Available-for-Sale Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance $ 427 $ 514 $ 634
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements (86) (92) (124)
Net transfers 1 (1) 0
Total gains (losses) realized & unrealized (1) 6 4
Ending Balance 341 427 514
Mortgage Loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 399 477 543
Purchases 0 0 0
Sales (1) (14) (1)
Issuances 0 0 0
Settlements (54) (63) (79)
Net transfers 29 (9) 2
Total gains (losses) realized & unrealized 15 8 12
Ending Balance 388 399 477
Net Derivatives      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 39 77 (37)
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements 37 54 36
Net transfers 0 0 0
Total gains (losses) realized & unrealized (11) (92) 78
Ending Balance 65 39 77
Long-term Debt      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (353) (385) (378)
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements 14 16 17
Net transfers 0 0 1
Total gains (losses) realized & unrealized (8) 16 (25)
Ending Balance (347) (353) (385)
Mortgage-related securities | Trading Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 28 26 47
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements 0 (1) (1)
Net transfers (3) 3 (11)
Total gains (losses) realized & unrealized 2 0 (9)
Ending Balance $ 27 $ 28 $ 26