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Capital (Retained Earnings and Dividend Policy) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 12, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 20, 2020
Jan. 01, 2020
Jul. 01, 2019
Jan. 01, 2018
Dec. 31, 2016
Capital [Line Items]                  
Restriction on Dividend Payment, Ratio of Market Value of Capital to Par Value of Capital Less than 70%   70.00%              
Ratio of Market Value of Capital to Par Value of Capital Stock   223.00%              
Retained Earnings, Set by the Board inc JCEA             $ 2,400 $ 2,500  
Excess Capital   $ 197 $ 166            
Excess Capital to Assets   0.18%              
Dividends [Abstract]                  
Dividends, Cash, Annualized Rate   7.00% 8.51% 7.50%          
Total dividends   $ 220 $ 283            
Interest Expense on Mandatorily Redeemable Capital Stock [1]   14 24 $ 32          
Retained Earnings Activity [Roll Forward]                  
Total Capital   6,741 6,530 6,806         $ 5,537
Net Income/(Loss)   327 360 376          
Cash dividends on capital stock   (206) (259) (187)          
Balance at end of the period   713 647            
Amount of Excess Stock and Financial Instruments Subject to Mandatory Redemption, Repurchased During Period   $ 1,224 1,753            
Subsequent Event                  
Capital [Line Items]                  
Retained Earnings, Set by the Board inc JCEA           $ 2,500      
Subsequent Events [Abstract]                  
Dividends, Cash Declared, Annualized Rate         7.00%        
Interest and Dividends Payable, Current         $ 54        
Dividends Payable         52        
Interest Payable, Current         $ 2        
Dividends Payable, Date to be Paid Mar. 12, 2020                
Minimum                  
Capital [Line Items]                  
Regulatory Restrictions on Payment of Capital Stock Dividends, Excess Stock to Assets, Percent   1.00%              
Limit on Dividend Payment, Ratio of Market Value of Capital to Par Value of Capital   70.00%              
Subsequent Events [Abstract]                  
Dividends, Cash Declared, Annualized Rate   5.00%              
Maximum                  
Capital [Line Items]                  
Limit on Dividend Payment, Ratio of Market Value of Capital to Par Value of Capital   100.00%              
Subsequent Events [Abstract]                  
Dividends, Cash Declared, Annualized Rate   7.00%              
Unrestricted Retained Earnings                  
Retained Earnings Activity [Roll Forward]                  
Total Capital   $ 2,754 2,699 2,670         888
Cash dividends on capital stock   (206) (259) (187)          
Total Restricted Retained Earnings                  
Retained Earnings Activity [Roll Forward]                  
Total Capital   $ 713 647 $ 575         $ 2,168
Special Dividend In Cash [Member]                  
Dividends [Abstract]                  
Total dividends     50            
Interest Expense on Mandatorily Redeemable Capital Stock     4            
Special Dividend In Cash [Member] | Unrestricted Retained Earnings                  
Retained Earnings Activity [Roll Forward]                  
Cash dividends on capital stock     $ (46)            
[1] The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments