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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Other Assets And Liabilities, Net [Member]
                
Included in earnings $ (76) [1] $ 258 [1] $ 26 [1] $ 438 [1]        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 (23) 0 (23)        
Sales 0 0 0 0        
Settlements 1 1 1 22        
Transfers to other balance sheet line items (74) (218) (209) (390)        
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 (81) 109 (81) 109 68 101 91 62
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 1 [2] 0 1 [2] 0        
Loans Held-for-Sale | Residential Mortgage, Loans Held For Sale [Member]
                
Included in earnings (1) 0 (1) 0        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales (3) 0 (13) (1)        
Settlements 0 0 0 0        
Transfers to other balance sheet line items (2) (2) (4) 3        
Transfers into Level 3 10 1 21 4        
Transferred Out of Level 3 in The Fair Value Hierarchy (2) (1) (3) (5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 8 2 8 2 6 8 4 1
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (1) [2] 0 (1) [2] 0        
Trading Account Assets [Member]
                
Included in earnings 3 [3] 0 12 [3] 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 (1) 0 (1) 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 69 49 69 49 67 58 49 49
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 3 [2],[3] 0 12 [2],[3] (1) [3],[4]        
Trading Account Assets [Member] | Asset-backed Securities [Member]
                
Included in earnings 1 0 1 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 0 0 0 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 6 5 6 5 5 5 5 5
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 1 [2] 0 1 [2] 0        
Trading Account Assets [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 (1) 0 (1) 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 0 1 0 1 1 1 1 1
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 0 0        
Trading Account Assets [Member] | Collateralized Debt Obligations [Member]
                
Included in earnings 2 0 11 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 0 0 0 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 63 43 63 43 61 52 43 43
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 2 [2] 0 11 [2] (1) [4]        
Available-for-sale Securities [Member]
                
Included in earnings 0 (1) [5] (1) [6] (4) [5]        
OCI 6 (5) (2) (15)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 65 74 110 164        
Sales (6) 0 (7) 0        
Settlements (23) (62) (39) (74)        
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 979 1,142 979 1,142 949 914 1,126 1,041
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 (1) [4],[5] (1) [2],[6] (4) [4],[5]        
Available-for-sale Securities [Member] | Equity Securities, Other [Member]
                
Included in earnings 0 0 0 0        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 65 72 110 162        
Sales 0 0 0 0        
Settlements 0 (46) (6) (46)        
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 737 857 737 857 672 633 831 741
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 0        
OCI 0 0 (2) 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales (6) 0 (7) 0        
Settlements (4) (2) (4) (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 37 55 37 55 47 46 57 58
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 (1) 0        
OCI 0 (1) (3) (2)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements (1) (1) (1) (1)        
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 22 17 22 17 23 21 17 16
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 (1) [2] 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 2 0 2        
Sales 0 0 0 0        
Settlements (3) (2) (3) (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 2 5 2 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] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
                
Included in earnings 0 (1) 0 (4)        
OCI 6 (4) 3 (14)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements (15) (11) (25) (23)        
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 181 208 181 208 202 209 216 221
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 (1) [4] 0 (4) [4]        
Loans Held For Investment [Member]
                
Included in earnings (7) [7] 5 [7] (12) [7] 1 [7]        
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) (14) (31) (26)        
Transfers to other balance sheet line items 1 1 3 (5)        
Transfers into Level 3 0 1 0 3        
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 339 406 339 406 360 379 413 433
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (7) [2],[7] 0 (11) [2],[7] 1 [4],[7]        
Derivative Financial Instruments, Liabilities [Member]
                
OCI   (103) [8]   (161) [8]        
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   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   0   1 [3],[4]        
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   (349)   (349)     (246) (189)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   $ 0   $ 1 [3]        
[1] 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 during the period related to financial assets still held at June 30, 2013.
[3] Amounts included in earnings are recognized in trading income.
[4] Change in unrealized gains/(losses) included in earnings for the period related to financial assets still held at June 30, 2012.
[5] Amounts included in earnings are generally recognized in net securities gains; however, any related hedge ineffectiveness is recognized in trading income.
[6] Amounts included in earnings are recognized in net securities gains.
[7] Amounts are generally included in mortgage production related income; however, the mark on certain fair value loans is included in trading income.
[8] Amount recognized in OCI is the effective portion of the cash flow hedges related to the Company’s probable forecasted sale of its shares of Coke common stock as discussed in Note 16, “Derivative Financial Instruments,” to the Consolidated Financial Statements in the 2012 Annual Report on Form 10-K.