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Deposit Liabilities (Tables)
 9 Months Ended
Sep. 30, 2017
Deposits [Abstract]  
Schedule of Deposit Liabilities [Table Text Block]
Deposit liabilities consisted of the following.
($ in millions)
September 30, 2017
 
December 31, 2016
Noninterest-bearing deposits
$
129

 
$
84

Interest-bearing deposits
 
 
 
Savings and money market checking accounts
50,287

 
46,976

Certificates of deposit
39,686

 
31,795

Dealer deposits
14

 
167

Total deposit liabilities
$
90,116

 
$
79,022