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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
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
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 (6) (2) (9) (4)        
Settlements 0 0 0 0        
Transfers to other balance sheet line items (1) (2) (1) (6)        
Transfers into Level 3 5 6 11 11        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 (1) 0 (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 2 3 2 3 $ 4 $ 1 $ 2 $ 3
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       145        
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       (121)        
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   21   21       68
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income       (6)        
Trading Account Assets [Member] | Asset-backed Securities [Member]                
Included in earnings [1]       1        
OCI       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       0        
Sales       (7)        
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   0   0       6
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 [1]       11        
OCI       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       0        
Sales       (65)        
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   0   0       54
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income       0        
Trading Assets [Member] | Derivative contracts, net [Member]                
Included in earnings 12 [2] 72 [3] 89 [2] 133 [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 (2) 1 1        
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 14 21 14 21 37 20 11 8
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 (6) [3],[4] (4) [2],[5] (6) [3],[4]        
Available-for-sale Securities [Member]                
Included in earnings 0 0 0 (2) [6]        
OCI 0 2 [7] 1 [8] 6 [7]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 83 135 104 135        
Sales 0 0 0 (20)        
Settlements (131) (79) (332) (114)        
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 719 958 719 958 767 946 900 953
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] | US States and Political Subdivisions Debt Securities [Member]                
Included in earnings 0 0 0 (2)        
OCI 0 (1) 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 (20)        
Settlements (1) 0 (7) 0        
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 12 5 12 6 12 13 34
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 0        
OCI 0 1 0 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements (4) 0 (4) 0        
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 17 22 17 22 21 21 21 21
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] | 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 0 0 0        
Sales 0 0 0 0        
Settlements (2) 0 (2) 0        
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 3 5 3 5 5 5 5 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 [Member]                
Included in earnings 0 0 0 0        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 83 135 104 135        
Sales 0 0 0 0        
Settlements (117) (68) (307) (95)        
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 582 779 582 779 616 785 712 739
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 0 0 0 0        
OCI 0 2 1 5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements (7) (11) (12) (19)        
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 112 140 112 140 119 123 149 154
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 0 0        
Loans Held For Investment [Member]                
Included in earnings (3) [9] 4 [10] 0 8 [10]        
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 (15) (12) (24) (23)        
Transfers to other balance sheet line items (1) 1 (1) 5        
Transfers into Level 3 14 0 16 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 263 292 263 292 268 272 299 302
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (4) [5],[9] 2 [4],[10] (2) [5],[9] 5 [4],[10]        
Other Liabilities [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 0 (10) 0        
Transfers to other balance sheet line items 0 0 0 (3)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liabilities Transfers Into Level 3 0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liabilities Transfers Out Of Level 3 0 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 2 [5],[11] 1 [4],[12] 6 [5],[11] 1 [4],[12]        
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 23 27 23 27 $ 21 $ 27 $ 26 $ 29
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 2 [11] 1 [12] 6 [11] 1 [12]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Interest Rate Lock Commitments [Member]                
Transferred Out of Level 3 in The Fair Value Hierarchy (37) (60) (97) (118)        
Interest Rate Lock Commitments [Member] | Trading Assets [Member] | Derivative contracts, net [Member]                
Transfers to other balance sheet line items $ (36) $ (60) $ (96) $ (121)        
[1] Amounts included in earnings are recognized in trading income.
[2] Includes issuances, fair value changes, and expirations and are recognized in mortgage production related income.
[3] Includes issuances, fair value changes, and expirations and are recognized in mortgage production related income.
[4] Change in unrealized gains/(losses) included in earnings for the period related to financial assets/liabilities still held at June 30, 2014
[5] Change in unrealized gains/(losses) included in earnings during the period related to financial assets/liabilities still held at June 30, 2015
[6] Amounts included in earnings are recognized in net securities gains/(losses).
[7] Amounts recognized in OCI are included in change in net unrealized (losses)/gains on securities AFS, net of tax
[8] Amount recognized in OCI is included in change in net unrealized (losses)/gains on securities AFS, net of tax.
[9] Amounts are generally included in mortgage production related income; however, the mark on certain fair value loans is included in trading income
[10] Amounts are generally included in mortgage production related income; however, the mark on certain fair value loans is included in trading income.
[11] Amounts included in earnings are recognized in other noninterest expense
[12] Amounts included in earnings are recognized in other noninterest expense.