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Commitments and Contingencies - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
May 04, 2023
Loss Contingencies [Line Items]            
Additions (reductions) in deposit balance     $ 0      
IDA balance ceiling amount above fixed-rate obligation           $ 30,000,000,000
IDA balance floor amount           60,000,000,000
IDA balance ceiling amount           $ 90,000,000,000
Ending IDA balance $ 82,200,000,000   82,200,000,000   $ 87,600,000,000  
Fixed-rate obligation IDA balance 63,700,000,000   63,700,000,000   66,600,000,000  
Floating-rate obligation IDA balance 18,500,000,000   18,500,000,000   $ 21,000,000,000.0  
Guarantees            
Loss Contingencies [Line Items]            
Liability for guarantees 0   0      
Residential real estate | First Mortgages            
Loss Contingencies [Line Items]            
Purchased during period 1,700,000,000 $ 851,000,000 2,700,000,000 $ 1,500,000,000    
Residential real estate | HELOCs            
Loss Contingencies [Line Items]            
Purchased during period $ 79,000,000 $ 47,000,000 $ 129,000,000 $ 83,000,000