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Investments in Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Amortized cost $ 827 $ 1,606
Amortized cost, one year or less 4  
Amortized cost, after one year through five years 24  
Amortized cost, after five years through ten years 27  
Amortized cost, after ten years 772  
Total fair value 837 1,697
Fair value, one year or less 4  
Fair value, after one year through five years 25  
Fair value, after five years through ten years 29  
Fair value, after ten years $ 779  
Weighted average yield 5.32%  
Weighted average yield, one year or less 6.09%  
Weighted average yield, after one year through five years 6.66%  
Weighted average yield, after five years through ten years 7.75%  
Weighted average yield, after ten years 5.19%  
Fannie Mae    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Amortized cost $ 492 1,094
Amortized cost, one year or less 0  
Amortized cost, after one year through five years 3  
Amortized cost, after five years through ten years 11  
Amortized cost, after ten years 478  
Total fair value 495 1,168
Fair value, one year or less 0  
Fair value, after one year through five years 3  
Fair value, after five years through ten years 12  
Fair value, after ten years 480  
Other agency    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Amortized cost 12 59
Amortized cost, one year or less 0  
Amortized cost, after one year through five years 0  
Amortized cost, after five years through ten years 1  
Amortized cost, after ten years 11  
Total fair value 12 65
Fair value, one year or less 0  
Fair value, after one year through five years 0  
Fair value, after five years through ten years 1  
Fair value, after ten years 11  
Private-label and other mortgage securities    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Amortized cost 3 4
Amortized cost, one year or less 0  
Amortized cost, after one year through five years 0  
Amortized cost, after five years through ten years 2  
Amortized cost, after ten years 1  
Total fair value 5 6
Fair value, one year or less 0  
Fair value, after one year through five years 0  
Fair value, after five years through ten years 2  
Fair value, after ten years 3  
Mortgage revenue bonds    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Amortized cost 142 211
Amortized cost, one year or less 4  
Amortized cost, after one year through five years 21  
Amortized cost, after five years through ten years 10  
Amortized cost, after ten years 107  
Total fair value 144 216
Fair value, one year or less 4  
Fair value, after one year through five years 22  
Fair value, after five years through ten years 10  
Fair value, after ten years 108  
Other mortgage-related securities    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Amortized cost 178 238
Amortized cost, one year or less 0  
Amortized cost, after one year through five years 0  
Amortized cost, after five years through ten years 3  
Amortized cost, after ten years 175  
Total fair value 181 $ 242
Fair value, one year or less 0  
Fair value, after one year through five years 0  
Fair value, after five years through ten years 4  
Fair value, after ten years $ 177