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Other Borrowings (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]    
FHLB advances $ 500 $ 0
Trust preferred securities 410 409
Total other borrowings 910 $ 409
E TRADE Securities [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 1,100  
Line of Credit Facility, Fair Value of Amount Outstanding 0  
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 300  
Line of Credit Facility, Fair Value of Amount Outstanding 0  
Revolving Credit Facility [Member] | Revolving credit facility maturing June 2018 [Member] | E TRADE Securities [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 450  
Secured Committed Line of Credit [Member] | E TRADE Securities [Member]    
Line of Credit Facility [Line Items]    
Lines of Credit. Number of Creditors 2  
Secured Committed Line of Credit [Member] | Line Of Credit Maturing June 2018 [Member] | E TRADE Securities [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 175  
Unsecured Uncommitted Line of Credit [Member] | E TRADE Securities [Member]    
Line of Credit Facility [Line Items]    
Lines of Credit. Number of Creditors 3  
Line of Credit Facility, Maximum Borrowing Capacity $ 125  
Unsecured Uncommitted Line of Credit [Member] | Line Of Credit Maturing June 2018 [Member] | E TRADE Securities [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 50  
Secured Uncommitted Line of Credit [Member] | E TRADE Securities [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 375