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Carrying Value of Those Assets Measured at Fair Value on a Non-Recurring Basis (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans Receivable, Fair Value Disclosure $ 177   $ 177   $ 196
Other Comprehensive Income (Loss), Unrealized Credit Risk Gain (Loss) on Long-term Debt Arising During Period, Net of Tax 1 $ 1 3 $ 0  
Transfer of Portfolio Loans and Leases to Held-for-sale 123 67 327 127  
Allowance for Loan and Lease Losses, Write-offs 101 $ 101 207 $ 248  
Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans Receivable, Fair Value Disclosure 0   0   0
Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans Receivable, Fair Value Disclosure 0   0   0
Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans Receivable, Fair Value Disclosure 177   177   196
Loans Held-For-Sale [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 85   85   13
Asset Impairment Charges 0   0   0
Loans Held-For-Sale [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Loans Held-For-Sale [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 85   85   13
Loans Held-For-Sale [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Loans Held-For-Investment [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 49   49   49
Asset Impairment Charges 0   0   0
Loans Held-For-Investment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Loans Held-For-Investment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Loans Held-For-Investment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 49   49   49
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 20   20   24
Asset Impairment Charges (2)   (3)   (4)
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 1   1   1
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 19   19   23
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 46   46   53
Asset Impairment Charges         (43)
Assets, Fair Value Adjustment (1)   14    
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 31   31   4
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure 15   15   49
Nonmarketable Equity Securities [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Adjustment 0   (23)    
Other Assets [Member] | Assets Leased to Others [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset Impairment Charges 0   0    
Other Assets [Member] | Software and Software Development Costs [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset Impairment Charges 0   (8)   (28)
Other Assets [Member] | Building [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset Impairment Charges         $ (10)
Other Assets [Member] | Land [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset Impairment Charges $ 0   $ 0