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Loans and Allowance for Loan Losses (Details 7) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Consumer portfolio loans    
Nonaccrual $ 361us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 375us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Loans held for investment 76,808us-gaap_NotesReceivableGross [1] 76,804us-gaap_NotesReceivableGross [1]
Total loans held for investment, before purchased credit-impaired loans 76,313ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans 76,279ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
Consumer    
Consumer portfolio loans    
Loans and Leases Receivable, Net Amount 26us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember		 28us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
Accrual 31,562ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember		 32,019ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
Nonaccrual 260us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember		 271us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
Total loans held for investment, before purchased credit-impaired loans 31,822ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember		 32,290ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
Consumer portfolio    
Consumer portfolio loans    
Accrual 31,379ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember		 31,823ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
Nonaccrual 260us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember		 271us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
Loans held for investment 31,639us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember		 32,094us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
Total loans held for investment, before purchased credit-impaired loans 31,639ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember		 32,094ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
Consumer portfolio | Residential mortgage    
Consumer portfolio loans    
Accrual 28,337ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		 28,746ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember
Nonaccrual 221us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		 231us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember
Total loans held for investment, before purchased credit-impaired loans 28,558ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		 28,977ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember
Consumer portfolio | Home equity and other consumer loans    
Consumer portfolio loans    
Accrual 3,042ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= ub_HomeEquityAndOtherConsumerLoansMember		 3,077ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= ub_HomeEquityAndOtherConsumerLoansMember
Nonaccrual 39us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= ub_HomeEquityAndOtherConsumerLoansMember		 40us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= ub_HomeEquityAndOtherConsumerLoansMember
Total loans held for investment, before purchased credit-impaired loans 3,081ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= ub_HomeEquityAndOtherConsumerLoansMember		 3,117ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_ConsumerLoansPortfolioSegmentMember
/ us-gaap_ProductOrServiceAxis
= ub_HomeEquityAndOtherConsumerLoansMember
Purchased credit-impaired loans    
Consumer portfolio loans    
Nonaccrual 9us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember		 9us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember
Loans held for investment 495us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember		 [2] 525us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember
Purchased credit-impaired loans | Consumer    
Consumer portfolio loans    
Accrual 183ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember		 196ub_FinancingReceivableRecordedInvestmentAccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
Nonaccrual 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember		 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
Total loans held for investment, before purchased credit-impaired loans $ 183ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember		 $ 196ub_LoansAndLeasesReceivableNetOfDeferredIncomeAndPurchasedCreditImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ub_PurchasedCreditImpairedLoanMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoanMember
[1] Includes $150 million and $151 million at March 31, 2015 and December 31, 2014, respectively, for net unamortized discounts and premiums and deferred fees and costs.
[2] Includes $116 million and $126 million as of March 31, 2015 and December 31, 2014, respectively, of loans for which the Company will be reimbursed a portion of any future losses under the terms of the FDIC loss share agreements.