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Reconciliation of the Beginning and Ending Balances for Fair Valued Assets and Liabilities Measured on a Recurring Basis Using Significant Unobservable Inputs (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Loans Held For Sale [Member] | Residential Mortgage, Loans Held For Sale [Member]
        
Included in earnings $ 0 $ 0    
OCI 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales (2) (10)    
Settlements 0 0    
Transfers to other balance sheet line items (4) (2)    
Transfers into Level 3 5 11    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 (1)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 2 6 3 8
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0    
Trading Account Assets [Member]
        
Included in earnings   111 [1]    
OCI   0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0    
Sales   0    
Settlements   0    
Transfers to other balance sheet line items   (135)    
Transfers into Level 3   0    
Transferred Out of Level 3 in The Fair Value Hierarchy   0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   166   190
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income   9 [1],[2]    
Trading Account Assets [Member] | Asset-backed Securities [Member]
        
Included in earnings 1 [1] 0    
OCI 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales (7) 0    
Settlements 0 0    
Transfers to other balance sheet line items 0 0    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 5 6 5
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 [1],[3] 0    
Trading Account Assets [Member] | Other Debt Obligations [Member]
        
Included in earnings   0    
OCI   0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0    
Sales   0    
Settlements   0    
Transfers to other balance sheet line items   0    
Transfers into Level 3   0    
Transferred Out of Level 3 in The Fair Value Hierarchy   0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   1   1
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income   0    
Trading Account Assets [Member] | Collateralized Debt Obligations [Member]
        
Included in earnings 11 [1] 9 [1]    
OCI 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales (65) 0    
Settlements 0 0    
Transfers to other balance sheet line items 0 0    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 61 54 52
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 [1],[3] 9 [1],[2]    
Trading Assets [Member]
        
Included in earnings 72 [1]      
OCI 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0      
Sales (72)      
Settlements 1      
Transfers to other balance sheet line items (58)      
Transfers into Level 3 0      
Transferred Out of Level 3 in The Fair Value Hierarchy 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 11   68  
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 [1],[3]      
Trading Assets [Member] | Derivative contracts, net [Member]
        
Included in earnings 60 [1] 102 [1]    
OCI 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales 0 0    
Settlements 1 0    
Transfers to other balance sheet line items (58) (135)    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 11 99 8 132
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 [1],[3] 0 [1],[3]    
Available-for-sale Securities [Member]
        
Included in earnings (2) [4] (1) [4]    
OCI 4 7 [5]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 45    
Sales (20) (1)    
Settlements (35) (15)    
Transfers to other balance sheet line items 0 0    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 900 949 953 914
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 [3],[4] (1) [2],[4]    
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
        
Included in earnings (2) 0    
OCI 1 2    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales (20) (1)    
Settlements 0 0    
Transfers to other balance sheet line items 0 0    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 13 47 34 46
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0    
Available-for-sale Securities [Member] | Asset-backed Securities [Member]
        
Included in earnings 0 [4] (1)    
OCI 0 3 [5]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales 0 0    
Settlements 0 0    
Transfers to other balance sheet line items 0 0    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 21 23 21 21
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 [3],[4] (1)    
Available-for-sale Securities [Member] | Other Debt Obligations [Member]
        
Included in earnings 0 0    
OCI 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales 0 0    
Settlements 0 0    
Transfers to other balance sheet line items 0 0    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5 5 5 5
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0    
Available-for-sale Securities [Member] | Equity Securities
        
Included in earnings 0 0    
OCI 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 45    
Sales 0 0    
Settlements (27) (6)    
Transfers to other balance sheet line items 0 0    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 712 672 739 633
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0    
Available-for-sale Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
        
Included in earnings 0 0 [4]    
OCI 3 2 [5]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales 0 0    
Settlements (8) (9)    
Transfers to other balance sheet line items 0 0    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 149 202 154 209
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 [2],[4]    
Loans Held For Investment [Member]
        
Included in earnings 4 [6] (5) [7]    
OCI 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Sales 0 0    
Settlements (11) (16)    
Transfers to other balance sheet line items 4 2    
Transfers into Level 3 0 0    
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 299 360 302 379
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 3 [3],[6] (4) [2],[7]    
Other Liabilities [Member]
        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 0    
Transfers to other balance sheet line items (3) 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liabilities Transfers Into Level 3 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liabilities Transfers Out Of Level 3 0 0    
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period 0 [3],[8] 0 [3],[8]    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 26 31 29 31
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 [8] 0 [8]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) $ 0 $ 0    
[1] 2 Amounts included in earnings are net of issuances, fair value changes, and expirations and are recognized in mortgage production related income.
[2] Change in unrealized gains/(losses) included in earnings for the period related to financial assets still held at March 31, 2013.
[3] Change in unrealized gains/(losses) included in earnings during the period related to financial assets still held at March 31, 2014.
[4] 3 Amounts included in earnings are recognized in trading income.
[5] 6 Amounts are generally included in mortgage production related income; however, the mark on certain fair value loans is included in trading income.
[6] 4 Amounts included in earnings are recognized in net securities (losses)/gains.
[7] 4 Amounts included in earnings are generally recognized in net securities (losses)/gains; however, any related hedge ineffectiveness is recognized in trading income.
[8] 5 Amount recognized in OCI is recognized in change in unrealized gains/(losses) on AFS securities.