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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
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Loans Held For Sale [Member] | Residential Mortgage, Loans Held For Sale [Member]
      
Included in earnings $ 1 $ 0  
OCI 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0  
Sales (25) (11)  
Settlements (1) 0  
Transfers to other balance sheet line items (8) 4  
Transfers into Level 3 32 22  
Transferred Out of Level 3 in The Fair Value Hierarchy (4) (8)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 3 8 1
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 (1)  
Trading Account Assets [Member]
      
Included in earnings   941 [1]  
OCI   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0  
Sales   0  
Settlements   (2)  
Transfers to other balance sheet line items   (882)  
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   190 133
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 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 6 5 5
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 1 [1],[3] 0  
Trading Account Assets [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 (1) 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 1 1
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0  
Trading Account Assets [Member] | Collateralized Debt Obligations [Member]
      
Included in earnings 23 [1] 11 [1]  
OCI 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0  
Sales (20) 0  
Settlements (1) (2)  
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 54 52 43
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 15 [1],[3] 9 [1],[2]  
Trading Assets [Member]
      
Included in earnings 122 [1]    
OCI 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0    
Sales (20)    
Settlements (2)    
Transfers to other balance sheet line items (222)    
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 68 190  
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 16 [1],[3]    
Trading Assets [Member] | Derivative contracts, net [Member]
      
Included in earnings 98 [1] 930 [1]  
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 (222) (882)  
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 8 132 84
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 (1) [4] (7) [4]  
OCI 1 42 [5]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 204 166  
Sales (6) 0  
Settlements (159) (328)  
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 953 914 1,041
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (1) [3],[4] (7) [2],[4]  
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
      
Included in earnings 0 0  
OCI 2 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0  
Sales (6) 0  
Settlements (8) (12)  
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 34 46 58
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 (1) [4] 0  
OCI 4 7 [5]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0  
Sales 0 0  
Settlements (3) (2)  
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 21 16
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (1) [3],[4] 0  
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 4 2  
Sales 0 0  
Settlements (4) (2)  
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
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 200 164  
Sales 0 0  
Settlements (94) (272)  
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 739 633 741
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 (7) [4]  
OCI (5) 35 [5]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0  
Sales 0 0  
Settlements (50) (40)  
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 154 209 221
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 (7) [2],[4]  
Loans Held For Investment [Member]
      
Included in earnings (5) [6] 7 [7]  
OCI 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0  
Sales 0 0  
Settlements (55) (49)  
Transfers to other balance sheet line items (17) (15)  
Transfers into Level 3 0 4  
Transferred Out of Level 3 in The Fair Value Hierarchy 0 (1)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 302 379 433
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (11) [3],[6] 11 [2],[7]  
Other Liabilities [Member]
      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 31  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (6) 325  
Transfers to other balance sheet line items 0 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 4 [3],[8] 0 [3],[8]  
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 29 31 211
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 4 [8] 308 [8]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) $ 0 $ (194)  
[1] 2 Amounts included in earnings are net of issuances, fair value changes, and expirations and are recognized in mortgage production related income/(loss).
[2] Change in unrealized gains/(losses) included in earnings for the period related to financial assets still held at December 31, 2012.
[3] Change in unrealized gains/(losses) included in earnings during the period related to financial assets still held at December 31, 2013.
[4] 3 Amounts included in earnings are recognized in trading income.
[5] 6 Amounts are generally included in mortgage production related income/(loss); however, the mark on certain fair value loans is included in trading income.
[6] 4 Amounts included in earnings are recognized in net securities gains.
[7] 4 Amounts included in earnings are generally recognized in net securities gains; however, any related hedge ineffectiveness is recognized in trading income.
[8] 5 Amount recognized in OCI is recognized in change in net unrealized gains on securities, net of tax.