Commercial Paper and Other Short-Term Borrowings (Tables)

9 Months Ended

Sep. 30, 2017

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)	September 30, 2017		December 31, 2016
Debt issued by MUB
Federal funds purchased, with a weighted average interest rate of 0.50% at December 31, 2016	$	—	$	26
Commercial paper, with a weighted average interest rate of 0.87% and 0.55% at September 30, 2017 and December 31, 2016, respectively	118		263
Federal Home Loan Bank advances, with a weighted average interest rate of 1.10% and 0.59% at September 30, 2017 and December 31, 2016, respectively	5,000		700
Total debt issued by MUB	5,118		989
Debt issued by other MUAH subsidiaries
Short-term debt due to BTMU, with weighted average interest rates of 1.68% and 0.49% at September 30, 2017 and December 31, 2016, respectively	169		679
Short-term debt due to BTMU, with a weighted average interest rate of 2.04% at September 30, 2017	42		—
Short-term debt due to affiliates, with weighted average interest rates of (0.06)% and (0.04)% at September 30, 2017 and December 31, 2016, respectively	697		692
Total debt issued by other MUAH subsidiaries	908		1,371
Total commercial paper and other short-term borrowings	$	6,026	$	2,360