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Deposit Liabilities (Tables)
 6 Months Ended
Jun. 30, 2017
Deposits [Abstract]  
Schedule of Deposit Liabilities [Table Text Block]
($ in millions)
June 30, 2017
 
December 31, 2016
Noninterest-bearing deposits
$
107

 
$
84

Interest-bearing deposits
 
 
 
Savings and money market checking accounts
50,732

 
46,976

Certificates of deposit
35,299

 
31,795

Dealer deposits
45

 
167

Total deposit liabilities
$
86,183

 
$
79,022