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Commercial Paper and Other Short-Term Borrowings (Tables)
6 Months Ended
Jun. 30, 2018
Short-term Debt [Abstract]  
Summary of Commercial Paper and Other Short-Term Borrowings
The following table is a summary of the Company's commercial paper and other short-term borrowings.
(Dollars in millions)
 
June 30, 2018
 
December 31, 2017
Debt issued by MUB
 
 
 
 
Commercial paper, with a weighted average interest rate of 1.92% and 1.26% at June 30, 2018 and December 31, 2017, respectively
 
$
462

 
$
347

Federal Home Loan Bank advances, with a weighted average interest rate of 2.06% and 1.42% at June 30, 2018 and December 31, 2017, respectively
 
8,200

 
5,750

Total debt issued by MUB
 
8,662

 
6,097

Debt issued by other MUAH subsidiaries
 


 
 
Short-term debt due to MUFG Bank, Ltd., with weighted average interest rates of 2.64% and 1.88% at June 30, 2018 and December 31, 2017, respectively
 
151

 
168

Short-term debt due to affiliates, with weighted average interest rates of (-.08)% and (-0.09)% at June 30, 2018 and December 31, 2017, respectively
 
951

 
801

Total debt issued by other MUAH subsidiaries
 
1,102

 
969

Total commercial paper and other short-term borrowings
 
$
9,764

 
$
7,066