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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Non Cancelable Future Commitments by Remaining Maturity [Table Text Block]
The following table summarizes by remaining maturity, non-cancelable future commitments related to loan and mortgage purchases, operating leases and other agreements.
 
As of December 31, 2017
 
Loans and Mortgage-Related Securities(1)
 
Operating Leases(2)
 
Other(3)
 
(Dollars in millions)
2018
 
$
73,130

 
 
$
41

 
$
98

2019
 
—

 
 
48

 
57

2020
 
—

 
 
56

 
73

2021
 
—

 
 
56

 
14

2022
 
—

 
 
58

 
1

Thereafter
 
—

 
 
609

 
—

Total
 
$
73,130

 
 
$
868

 
$
243

__________

(1) 
Primarily includes $72.7 billion that has been accounted for as mortgage commitment derivatives.
(2) 
Includes amounts related to office buildings and equipment leases.
(3) 
Includes purchase commitments for certain telecommunications services, computer software and services, and other agreements and commitments.