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Deposit Liabilities (Tables)
 6 Months Ended
Jun. 30, 2018
Deposits [Abstract]  
Deposit Liabilities, Type [Table Text Block]
Deposit liabilities consisted of the following.
($ in millions)
June 30, 2018
 
December 31, 2017
Noninterest-bearing deposits
$
153

 
$
108

Interest-bearing deposits
 
 
 
Savings and money market checking accounts
50,958

 
49,267

Certificates of deposit
47,617

 
43,869

Dealer deposits
6

 
12

Total deposit liabilities
$
98,734

 
$
93,256