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Regulatory Requirements - Bank Capital Requirements (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total risk-based capital [Abstract]        
Minimum percentage of Common Equity Tier 1 capital conservation buffer 2.50% 2.50%    
Minimum [Member] | Capital conservation buffer [Member]        
Common equity Tier I capital [Abstract]        
Common Equity Tier 1 Capital Required To Be Well Capitalized To Risk Weighted Assets 4.50% 4.50%    
Tier I risk based capital [Abstract]        
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00% 6.00%    
Total risk-based capital [Abstract]        
Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%    
Parent Company [Member]        
Tier I leverage [Abstract]        
Tier 1 Leverage Capital $ 4,035 $ 4,035 $ 4,097  
Tier 1 Leverage Capital to Average Assets 6.90% 6.90% 6.60%  
Tier 1 Leverage Capital Required to be Well Capitalized $ 2,922 $ 2,922 $ 3,101  
Tier 1 Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00% 5.00%  
Excess Tier 1 Leverage Capital $ 1,113 $ 1,113 $ 996  
Common equity Tier I capital [Abstract]        
Common Equity Tier 1 Capital $ 3,346 $ 3,346 $ 3,408  
Common Equity Tier 1 Capital to Risk Weighted Assets 31.50% 31.50% 31.10%  
Common Equity Tier 1 Capital Required To Be Well Capitalized $ 692 $ 692 $ 713  
Common Equity Tier 1 Capital Required To Be Well Capitalized To Risk Weighted Assets 6.50% 6.50% 6.50%  
Excess Common Equity Tier 1 Capital To Be Well Capitalized $ 2,654 $ 2,654 $ 2,695  
Tier I risk based capital [Abstract]        
Tier One Risk Based Capital $ 4,035 $ 4,035 $ 4,097  
Tier One Risk Based Capital to Risk Weighted Assets 37.90% 37.90% 37.30%  
Tier One Risk Based Capital Required to be Well Capitalized $ 852 $ 852 $ 877  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00% 8.00%  
Excess Tier One Risk Based Capital to be Well Capitalized $ 3,183 $ 3,183 $ 3,220  
Total risk-based capital [Abstract]        
Capital $ 4,060 $ 4,060 $ 4,143  
Capital to Risk Weighted Assets 38.20% 38.20% 37.80%  
Capital Required to be Well Capitalized $ 1,064 $ 1,064 $ 1,097  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00% 10.00%  
Excess capital $ 2,996 $ 2,996 $ 3,046  
Dividends from subsidiaries paid to parent company   1,770 1,150 $ 350
E TRADE Bank [Member]        
Tier I leverage [Abstract]        
Tier 1 Leverage Capital $ 3,240 $ 3,240 $ 3,484  
Tier 1 Leverage Capital to Average Assets 7.20% 7.20% 7.10%  
Tier 1 Leverage Capital Required to be Well Capitalized $ 2,253 $ 2,253 $ 2,461  
Tier 1 Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00% 5.00%  
Excess Tier 1 Leverage Capital $ 987 $ 987 $ 1,023  
Common equity Tier I capital [Abstract]        
Common Equity Tier 1 Capital $ 3,240 $ 3,240 $ 3,484  
Common Equity Tier 1 Capital to Risk Weighted Assets 36.50% 36.50% 34.90%  
Common Equity Tier 1 Capital Required To Be Well Capitalized $ 577 $ 577 $ 650  
Common Equity Tier 1 Capital Required To Be Well Capitalized To Risk Weighted Assets 6.50% 6.50% 6.50%  
Excess Common Equity Tier 1 Capital To Be Well Capitalized $ 2,663 $ 2,663 $ 2,834  
Tier I risk based capital [Abstract]        
Tier One Risk Based Capital $ 3,240 $ 3,240 $ 3,484  
Tier One Risk Based Capital to Risk Weighted Assets 36.50% 36.50% 34.90%  
Tier One Risk Based Capital Required to be Well Capitalized $ 710 $ 710 $ 800  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00% 8.00%  
Excess Tier One Risk Based Capital to be Well Capitalized $ 2,530 $ 2,530 $ 2,684  
Total risk-based capital [Abstract]        
Capital $ 3,257 $ 3,257 $ 3,521  
Capital to Risk Weighted Assets 36.70% 36.70% 35.20%  
Capital Required to be Well Capitalized $ 888 $ 888 $ 999  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00% 10.00%  
Excess capital $ 2,369 $ 2,369 $ 2,522  
Dividends from subsidiaries paid to parent company 835      
E TRADE Savings Bank        
Tier I leverage [Abstract]        
Tier 1 Leverage Capital $ 1,480 $ 1,480 $ 1,456  
Tier 1 Leverage Capital to Average Assets 40.70% 40.70% 26.60%  
Tier 1 Leverage Capital Required to be Well Capitalized $ 182 $ 182 $ 273  
Tier 1 Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00% 5.00%  
Excess Tier 1 Leverage Capital $ 1,298 $ 1,298 $ 1,183  
Common equity Tier I capital [Abstract]        
Common Equity Tier 1 Capital $ 1,480 $ 1,480 $ 1,456  
Common Equity Tier 1 Capital to Risk Weighted Assets 224.70% 224.70% 169.40%  
Common Equity Tier 1 Capital Required To Be Well Capitalized $ 43 $ 43 $ 56  
Common Equity Tier 1 Capital Required To Be Well Capitalized To Risk Weighted Assets 6.50% 6.50% 6.50%  
Excess Common Equity Tier 1 Capital To Be Well Capitalized $ 1,437 $ 1,437 $ 1,400  
Tier I risk based capital [Abstract]        
Tier One Risk Based Capital $ 1,480 $ 1,480 $ 1,456  
Tier One Risk Based Capital to Risk Weighted Assets 224.70% 224.70% 169.40%  
Tier One Risk Based Capital Required to be Well Capitalized $ 53 $ 53 $ 69  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00% 8.00%  
Excess Tier One Risk Based Capital to be Well Capitalized $ 1,427 $ 1,427 $ 1,387  
Total risk-based capital [Abstract]        
Capital $ 1,480 $ 1,480 $ 1,456  
Capital to Risk Weighted Assets 224.70% 224.70% 169.40%  
Capital Required to be Well Capitalized $ 66 $ 66 $ 86  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00% 10.00%  
Excess capital $ 1,414 $ 1,414 $ 1,370