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Investments in Securities Available-for-sale Securities 3 (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]      
Less Than 12 Consecutive Months, Gross Unrealized Losses $ (1) $ (1)  
Less Than 12 Consecutive Months, Fair Value 40 130  
12 Consecutive Months or Longer, Gross Unrealized Losses (11) (13)  
12 Consecutive Months or Longer, Fair Value 94 340  
Net unrealized gains on AFS securities for which we have not recorded OTTI 74 97 $ 52
Accumulated other comprehensive income 116 131 322
Accumulated Other Comprehensive Income (Loss), Net of Tax, Available-for-sale Securities, Other-than-temporary Impairment Recorded     224
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (42) 34 $ 46
Fannie Mae [Member]      
Debt Securities, Available-for-sale [Line Items]      
Less Than 12 Consecutive Months, Gross Unrealized Losses (1) 0  
Less Than 12 Consecutive Months, Fair Value 40 0  
12 Consecutive Months or Longer, Gross Unrealized Losses (11) (10)  
12 Consecutive Months or Longer, Fair Value 94 337  
Mortgage revenue bonds [Member]      
Debt Securities, Available-for-sale [Line Items]      
Less Than 12 Consecutive Months, Gross Unrealized Losses 0 0  
Less Than 12 Consecutive Months, Fair Value 0 0  
12 Consecutive Months or Longer, Gross Unrealized Losses 0 (3)  
12 Consecutive Months or Longer, Fair Value 0 3  
Other mortgage-related securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Less Than 12 Consecutive Months, Gross Unrealized Losses 0 (1)  
Less Than 12 Consecutive Months, Fair Value 0 130  
12 Consecutive Months or Longer, Gross Unrealized Losses 0 0  
12 Consecutive Months or Longer, Fair Value $ 0 $ 0