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Deposit Liabilities (Tables)
 3 Months Ended
Mar. 31, 2017
Deposits [Abstract]  
Schedule of Deposit Liabilities [Table Text Block]
Deposit liabilities consisted of the following.
($ in millions)
March 31, 2017
 
December 31, 2016
Noninterest-bearing deposits
$
102

 
$
84

Interest-bearing deposits
 
 
 
Savings and money market checking accounts
51,150

 
46,976

Certificates of deposit
33,148

 
31,795

Dealer deposits
86

 
167

Total deposit liabilities
$
84,486

 
$
79,022