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Short-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Short-Term Debt [Line Items]    
Short-term debt, outstanding $ 24,896 $ 33,756
Short-term debt, weighted-average interest rate 2.29% 1.18%
Line of Credit [Member]    
Short-Term Debt [Line Items]    
Line of credit maximum borrowing capacity $ 15,000 $ 15,000
Consolidated Trusts [Member]    
Short-Term Debt [Line Items]    
Short-term debt, outstanding $ 0 $ 379
Short-term debt, weighted-average interest rate 0.00% 1.11%
Fannie Mae [Member]    
Short-Term Debt [Line Items]    
Short-term debt, outstanding $ 24,896 $ 33,377
Short-term debt, weighted-average interest rate 2.29% 1.18%