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Customer Deposits (Tables)
 12 Months Ended
Dec. 31, 2018
Banking and Thrift [Abstract]  
Schedule of customer deposits [Table Text Block] Customer deposits consisted of the following:
 
December 31,
2018
 
2017
(in millions)
Fixed rate certificates
$
7,377

 
$
5,837

Stock market certificates
476

 
520

Stock market embedded derivative
6

 
10

Other
33

 
33

Less: accrued interest classified in other liabilities
(7
)
 
(12
)
Total investment certificate reserves
7,885

 
6,388

Brokerage deposits
3,660

 
3,915

Total
$
11,545

 
$
10,303