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Investments in Securities - Available-for-sale Securities Gains (Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Less than 12 consecutive months, gross unrealized losses $ (8) $ (1)  
Less than 12 consecutive months, fair value 228 40  
12 consecutive months or longer, gross unrealized losses (6) (11)  
12 consecutive months or longer, fair value 102 94  
Gross realized gains 59 57 $ 265
Proceeds from sales of available-for-sale securities 582 361 537
Net unrealized gains on AFS securities for which we have not recorded an allowance for credit losses 9 74 97
Net unrealized gains (losses) on AFS securities for which we have recorded an allowance for credit losses (2) 0  
Net unrealized gains (losses) on AFS securities for which we have recorded OTTI     0
Other 31 42 34
Accumulated other comprehensive income 38 116 131
Other than temporary impairment, credit losses recognized in earnings     $ 36
Fannie Mae      
Debt Securities, Available-for-sale [Line Items]      
Less than 12 consecutive months, gross unrealized losses (5) (1)  
Less than 12 consecutive months, fair value 225 40  
12 consecutive months or longer, gross unrealized losses (6) (11)  
12 consecutive months or longer, fair value 102 94  
Mortgage revenue bonds      
Debt Securities, Available-for-sale [Line Items]      
Less than 12 consecutive months, gross unrealized losses (3) 0  
Less than 12 consecutive months, fair value 3 0  
12 consecutive months or longer, gross unrealized losses 0 0  
12 consecutive months or longer, fair value $ 0 $ 0