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Fair Value - Level 3 Valuation Inputs (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities: $ 445 $ 469
Net derivatives 103 151
Recurring    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 78,902 78,728
Available-for-sale securities: 445 469
Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 26 28
Available-for-sale securities: 405 427
Significant Unobservable Inputs (Level 3) | Recurring    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 26 28
Available-for-sale securities: 405 427
Significant Unobservable Inputs (Level 3) | Recurring | Dealer Mark and Discounted Cash Flow    
Fair Value Inputs, Quantitative Information [Line Items]    
Net derivatives 35 39
Mortgage-related securities | Recurring    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 1,018 1,098
Mortgage-related securities | Significant Unobservable Inputs (Level 3) | Recurring    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 26 28
Mortgage-related securities | Significant Unobservable Inputs (Level 3) | Recurring | Primarily Consensus    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 26 28
Agency | Significant Unobservable Inputs (Level 3) | Recurring | Discounted Cash Flow, Single Vendor, and Consensus    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities: 290  
Agency | Significant Unobservable Inputs (Level 3) | Recurring | Consensus    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities:   301
Other mortgage-related | Recurring    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities: 119 130
Other mortgage-related | Significant Unobservable Inputs (Level 3) | Recurring    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities: 115 126
Other mortgage-related | Significant Unobservable Inputs (Level 3) | Recurring | Primarily Discounted Cash Flow, Single Vendor, and Consensus    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities: $ 115 $ 126