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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Loans Held For Sale [Member] | Residential Mortgage, Loans Held For Sale [Member]
                
Included in earnings $ 0 $ 0 $ 0 $ 0        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales (3) (4) (7) (20)        
Settlements 0 0 0 0        
Transfers to other balance sheet line items 0 5 6 8        
Transfers into Level 3 1 6 12 28        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 (1) (1) (4)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1 4 1 4 3 3 8 8
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 0 0        
Trading Account Assets [Member]
                
Included in earnings   46 [1]   83 [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   (50)   159        
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   114   114     17 190
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income   0 [1],[2]   12 [1],[2]        
Trading Account Assets [Member] | Asset-backed Securities [Member]
                
Included in earnings   0 1 [3] 1        
OCI   0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0 0        
Sales   0 (7) 0        
Settlements   0 0 0        
Transfers to other balance sheet line items   0 0 0        
Transfers into Level 3   0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy   0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 6 0 6   6 6 5
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income   0 0 [3],[4] 1        
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       (1)        
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   0   0       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   0 [1] 11 [3] 11 [1]        
OCI   0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0 0        
Sales   0 (65) 0        
Settlements   0 0 0        
Transfers to other balance sheet line items   0 0 0        
Transfers into Level 3   0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy   0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 63 0 63   54 63 52
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income   0 [1],[2] 0 [3],[4] 11 [1],[2]        
Trading Assets [Member]
                
Included in earnings     192 [3]          
OCI     0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases     0          
Sales     (72)          
Settlements     (2)          
Transfers to other balance sheet line items     185          
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 5   5     68    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income     (10) [3],[4]          
Trading Assets [Member] | Derivative contracts, net [Member]
                
Included in earnings 47 46 [3] 180 [3] 71 [3]        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements 1 1 (2) 1        
Transfers to other balance sheet line items 64              
Transfers into Level 3 0 0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5 45 5 45 21 8 (52) 132
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 16 0 [3],[4] (10) [3],[4] 0 [3],[4]        
Available-for-sale Securities [Member]
                
Included in earnings (1) 0 [5] (3) [6] (1) [5]        
OCI (1) [7] (2) [8] 5 0 [8]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 135 4 270 114        
Sales 0 0 (20) (7)        
Settlements (97) (86) (211) (125)        
Transfers to other balance sheet line items (6) 0 (6) 0        
Transfers into Level 3 0 0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,000 895 1,000 895 958 953 979 914
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (1) 0 [2],[5] (1) [4],[6] (1) [2],[5]        
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
                
Included in earnings 0 0 (2) 0        
OCI 0 0 [8] 0 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 (20) (7)        
Settlements 0 (3) 0 (7)        
Transfers to other balance sheet line items 0 0 0 0        
Transfers into Level 3 0 0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 12 34 12 34 12 34 37 46
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 0 0        
Available-for-sale Securities [Member] | Asset-backed Securities [Member]
                
Included in earnings 0 0 0 [6] (1)        
OCI 0 0 [8] 1 3 [8]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements (1) (1) (1) (2)        
Transfers to other balance sheet line items 0 0 0 0        
Transfers into Level 3 0 0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 21 21 21 21 22 21 22 21
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 0 [4],[6] (1)        
Available-for-sale Securities [Member] | Other Debt Obligations [Member]
                
Included in earnings 0 0 0 0        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 4 0 4        
Sales 0 0 0 0        
Settlements 0 (1) 0 (4)        
Transfers to other balance sheet line items 0 0 0 0        
Transfers into Level 3 0 0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 5 5 5 5 5 5 2 5
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 0 0        
Available-for-sale Securities [Member] | Equity Securities
                
Included in earnings 0 0 0 0        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 135 0 270 110        
Sales 0 0 0 0        
Settlements (90) (68) (185) (74)        
Transfers to other balance sheet line items (6) 0 (6) 0        
Transfers into Level 3 0 0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 830 669 830 669 779 739 737 633
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 0 0        
Available-for-sale Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
                
Included in earnings (1) 0 [5] (1) 0 [5]        
OCI (1) [7] (2) [8] 4 (5) [8]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements (6) (13) (25) (38)        
Transfers to other balance sheet line items 0 0 0 0        
Transfers into Level 3 0 0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 132 166 132 166 140 154 181 209
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (1) 0 [2],[5] (1) 0 [2],[5]        
Loans Held For Investment [Member]
                
Included in earnings 1 [9] 4 [9] 9 [9] (2) [9]        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements (8) (15) (31) (47)        
Transfers to other balance sheet line items 2 12 (3) 14        
Transfers into Level 3 1 0 1 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 284 316 284 316 292 302 339 379
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 1 [4],[9] 2 6 [4],[9] (8) [2],[9]        
Other Liabilities [Member]
                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0   0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0   0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (3)   (3) (4)        
Transfers to other balance sheet line items 0   3 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liabilities Transfers Into Level 3 0   0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liabilities Transfers Out Of Level 3 0   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 [10],[4]   0 [10],[4] 1 [10],[4]        
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 24 26 24 26 27 29   31
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 [10]   1 [10] (1) [10]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0   0 0        
Derivative Financial Instruments, Liabilities [Member]
                
OCI   0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases   0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales   0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   (3)            
Transfers to other balance sheet line items   0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liabilities Transfers Into Level 3   0            
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liabilities Transfers Out Of Level 3   0            
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period   0            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   26   26     29  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   0 [5]            
Interest Rate Lock Commitments [Member]
                
Transferred Out of Level 3 in The Fair Value Hierarchy 64 50 181 (159)        
Interest Rate Lock Commitments [Member] | Trading Assets [Member] | Derivative contracts, net [Member]
                
Transfers to other balance sheet line items   $ (50) $ 185 $ 159        
[1] September 30, 2013.2 Amounts included in earnings are net of issuances, fair value changes, and expirations and are recognized in mortgage production related inco
[2] 1 Change in unrealized gains/(losses) included in earnings for the period related to financial assets still held at
[3] September 30, 2014.2 Amounts included in earnings are net of issuances, fair value changes, and expirations and are recognized in mortgage production related inco
[4] 1 Change in unrealized gains/(losses) included in earnings during the period related to financial assets still held at
[5] e.3 Amounts included in earnings are recognized in trading inco
[6] e/(loss).3 Amounts included in earnings are recognized in trading inco
[7] s.6 Amounts are generally included in mortgage production related income/(loss); however, the mark on certain fair value loans is included in trading inco
[8] s.6 Amounts are generally included in mortgage production related income; however, the mark on certain fair value loans is included in trading inco
[9] e.4 Amounts included in earnings are recognized in net securities (losses)/gai
[10] s.5 Amount recognized in OCI is recognized in change in unrealized gains/(losses) on AFS securiti