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Deposits (Tables)
12 Months Ended
Dec. 31, 2017
Deposits [Abstract]  
Deposit Liabilities, Type
Deposits are summarized as follows (dollars in millions):
 
Amount
 
Weighted-Average Rate
 
December 31,
 
December 31,
 
2017
 
2016
 
2017
 
2016
Sweep deposits
$
37,734

 
$
26,362

 
0.01
%
 
0.01
%
Savings deposits
2,912

 
3,185

 
0.01
%
 
0.01
%
Other deposits(1)
2,096

 
2,135

 
0.03
%
 
0.03
%
Total deposits
$
42,742

 
$
31,682

 
0.01
%
 
0.01
%
(1)
Includes checking deposits, money market deposits and certificates of deposit. As of December 31, 2017 and 2016, the Company had $207 million and $177 million in non-interest bearing deposits, respectively.