Commercial Paper and Other Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2016

Short-term Debt [Abstract]

Summary of Commercial Paper and Other Short-Term Borrowings

The following is a summary of the Company's commercial paper and other short-term borrowings:

(Dollars in millions)	December 31, 2016		December 31, 2015
Debt issued by MUB
Federal funds purchased, with weighted average interest rates of 0.50% and 0.11% at December 31, 2016 and December 31, 2015, respectively	$	26	$	8
Commercial paper, with a weighted average interest rate of 0.55% and 0.24% at December 31, 2016 and December 31, 2015, respectively	263		994
Federal Home Loan Bank advances, with a weighted average interest rate of 0.59% at December 31, 2016	700		—
Total debt issued by MUB	989		1,002
Debt issued by other MUAH subsidiaries
Short-term debt due to BTMU, with weighted average interest rates of 0.49% and 0.64% at December 31, 2016 and December 31, 2015, respectively	679		1,525
Short-term debt due to affiliates, with weighted average interest rates of (0.04)% and 0.28% at December 31, 2016 and December 31, 2015, respectively	692		898
Total debt issued by other MUAH subsidiaries	1,371		2,423
Total commercial paper and other short-term borrowings	$	2,360	$	3,425