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Commitments, Contingencies, Guarantees, and Others (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Letter of Credit and Other Loan Commitments [Table Text Block]
The following table presents contractual amount and carrying value of our unfunded lending commitments as of December 31, 2017 and 2016. The carrying value represents our reserve and deferred revenue on legally binding commitments.
Table 19.1: Unfunded Lending Commitments: Contractual Amount and Carrying Value
 
 
Contractual Amount
 
Carrying Value
(Dollars in millions)
 
December 31,
2017
 
December 31,
2016
 
December 31,
2017
 
December 31,
2016
Standby letter of credit and commercial letter of credit(1)
 
$
2,046

 
$
1,936

 
$
43

 
$
42

Credit card lines
 
351,481

 
312,864

 
N/A

 
N/A

Other loan commitments(2)
 
31,840

 
28,402

 
84

 
98

Total unfunded lending commitments
 
$
385,367

 
$
343,202

 
$
127

 
$
140

__________
(1) 
These financial guarantees have expiration dates ranging from 2018 to 2025 as of December 31, 2017.
(2) 
Includes $1.0 billion and $699 million of advised lines of credit as of December 31, 2017 and 2016, respectively.