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Securities-Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Securities (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Gain (Loss) on Investments [Line Items]    
Amortized cost $ 122,223 $ 117,868
Gross unrealized Gains 1,615 2,122
Gross unrealized Losses 792 533
Fair value 123,046 119,457
AOCI, transfers from AFS to HTM Securities, gross unrealized gains 99 60
AOCI, transfers from AFS to HTM Securities, gross unrealized losses 280 282
Available-for-sale    
Gain (Loss) on Investments [Line Items]    
Amortized cost 78,797 [1] 96,935 [2]
Gross unrealized Gains 1,363 [1] 1,854 [2]
Gross unrealized Losses 552 [1],[3] 459 [2],[4]
Fair value 79,608 [1] 98,330 [2]
Available-for-sale | U.S. Treasury    
Gain (Loss) on Investments [Line Items]    
Amortized cost 12,968 19,592
Gross unrealized Gains 147 420
Gross unrealized Losses 48 15
Fair value 13,067 19,997
Available-for-sale | U.S. Government agencies    
Gain (Loss) on Investments [Line Items]    
Amortized cost 411 342
Gross unrealized Gains 1 3
Gross unrealized Losses 2 2
Fair value 410 343
Available-for-sale | State and political subdivisions    
Gain (Loss) on Investments [Line Items]    
Amortized cost 4,471 5,176
Gross unrealized Gains 77 95
Gross unrealized Losses 21 24
Fair value 4,527 5,247
Available-for-sale | Agency RMBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 23,622 32,568
Gross unrealized Gains 308 357
Gross unrealized Losses 290 325
Fair value 23,640 32,600
Available-for-sale | Non-agency RMBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 870 942
Gross unrealized Gains 35 37
Gross unrealized Losses 23 26
Fair value 882 953
Available-for-sale | Other RMBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 1,399 1,551
Gross unrealized Gains 21 25
Gross unrealized Losses 23 25
Fair value 1,397 1,551
Available-for-sale | Commercial MBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 1,789 1,927
Gross unrealized Gains 24 39
Gross unrealized Losses 11 7
Fair value 1,802 1,959
Available-for-sale | Agency commercial MBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 3,784 3,105
Gross unrealized Gains 30 36
Gross unrealized Losses 30 9
Fair value 3,784 3,132
Available-for-sale | Asset-backed CLOs    
Gain (Loss) on Investments [Line Items]    
Amortized cost 2,241 2,128
Gross unrealized Gains 6 9
Gross unrealized Losses 2 7
Fair value 2,245 2,130
Available-for-sale | Other asset-backed securities    
Gain (Loss) on Investments [Line Items]    
Amortized cost 3,347 3,241
Gross unrealized Gains 5 5
Gross unrealized Losses 4 6
Fair value 3,348 3,240
Available-for-sale | Foreign covered bonds    
Gain (Loss) on Investments [Line Items]    
Amortized cost 2,666 2,788
Gross unrealized Gains 60 80
Gross unrealized Losses 1 0
Fair value 2,725 2,868
Available-for-sale | Corporate bonds    
Gain (Loss) on Investments [Line Items]    
Amortized cost 1,784 1,747
Gross unrealized Gains 33 45
Gross unrealized Losses 15 7
Fair value 1,802 1,785
Available-for-sale | Sovereign debt/sovereign guaranteed    
Gain (Loss) on Investments [Line Items]    
Amortized cost 14,852 17,062
Gross unrealized Gains 187 224
Gross unrealized Losses 74 2
Fair value 14,965 17,284
Available-for-sale | Other debt securities    
Gain (Loss) on Investments [Line Items]    
Amortized cost 2,181 2,162
Gross unrealized Gains 8 7
Gross unrealized Losses 2 0
Fair value 2,187 2,169
Available-for-sale | Equity securities    
Gain (Loss) on Investments [Line Items]    
Amortized cost 10 94
Gross unrealized Gains 1 1
Gross unrealized Losses 0 0
Fair value 11 95
Available-for-sale | Money market funds    
Gain (Loss) on Investments [Line Items]    
Amortized cost 776 763
Gross unrealized Gains 0 0
Gross unrealized Losses 0 0
Fair value 776 763
Available-for-sale | Non-agency RMBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 1,626 [5] 1,747 [6]
Gross unrealized Gains 420 [5] 471 [6]
Gross unrealized Losses 6 [5],[7] 4 [6],[8]
Fair value 2,040 [5] 2,214 [6]
Held-to-maturity    
Gain (Loss) on Investments [Line Items]    
Amortized cost 43,426 20,933
Gross unrealized Gains 252 268
Gross unrealized Losses 240 74
Fair value 43,438 21,127
Held-to-maturity | U.S. Treasury    
Gain (Loss) on Investments [Line Items]    
Amortized cost 11,171 5,047
Gross unrealized Gains 44 32
Gross unrealized Losses 32 16
Fair value 11,183 5,063
Held-to-maturity | U.S. Government agencies    
Gain (Loss) on Investments [Line Items]    
Amortized cost 1,447 344
Gross unrealized Gains 1 0
Gross unrealized Losses 3 3
Fair value 1,445 341
Held-to-maturity | State and political subdivisions    
Gain (Loss) on Investments [Line Items]    
Amortized cost 21 24
Gross unrealized Gains 1 1
Gross unrealized Losses 1 1
Fair value 21 24
Held-to-maturity | Agency RMBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 26,361 14,006
Gross unrealized Gains 180 200
Gross unrealized Losses 163 44
Fair value 26,378 14,162
Held-to-maturity | Non-agency RMBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 137 153
Gross unrealized Gains 7 9
Gross unrealized Losses 2 2
Fair value 142 160
Held-to-maturity | Other RMBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 269 315
Gross unrealized Gains 2 2
Gross unrealized Losses 7 8
Fair value 264 309
Held-to-maturity | Commercial MBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 10 13
Gross unrealized Gains 0 0
Gross unrealized Losses 0 0
Fair value 10 13
Held-to-maturity | Agency commercial MBS    
Gain (Loss) on Investments [Line Items]    
Amortized cost 364  
Gross unrealized Gains 0  
Gross unrealized Losses 7  
Fair value 357  
Held-to-maturity | Sovereign debt/sovereign guaranteed    
Gain (Loss) on Investments [Line Items]    
Amortized cost 3,614 1,031
Gross unrealized Gains 17 24
Gross unrealized Losses 24 0
Fair value 3,607 $ 1,055
Held-to-maturity | Other debt securities    
Gain (Loss) on Investments [Line Items]    
Amortized cost 32  
Gross unrealized Gains 0  
Gross unrealized Losses 1  
Fair value $ 31  
[1] Includes gross unrealized gains of $99 million and gross unrealized losses of $280 million recorded in accumulated other comprehensive income related to investment securities that were transferred from available-for-sale to held-to-maturity. The unrealized gains and losses primarily related to Agency RMBS and will be amortized into net interest revenue over the estimated lives of the securities.
[2] Includes gross unrealized gains of $60 million and gross unrealized losses of $282 million recorded in accumulated other comprehensive income related to investment securities that were transferred from available-for-sale to held-to-maturity. The unrealized gains and losses primarily related to Agency RMBS and will be amortized into net interest revenue over the estimated lives of the securities.
[3] Includes gross unrealized losses for 12 months or more of $280 million recorded in accumulated other comprehensive income related to investment securities that were transferred from available-for-sale to held-to-maturity. The unrealized losses primarily related to Agency RMBS and will be amortized into net interest revenue over the estimated lives of the securities.
[4] Includes gross unrealized losses for 12 months or more of $282 million recorded in accumulated other comprehensive income related to investment securities that were transferred from available-for-sale to held-to-maturity. The unrealized losses primarily related to Agency RMBS and will be amortized into net interest revenue over the estimated lives of the securities.
[5] Previously included in the Grantor Trust. The Grantor Trust was dissolved in 2011.
[6] Previously included in the Grantor Trust. The Grantor Trust was dissolved in 2011.
[7] Previously included in the Grantor Trust. The Grantor Trust was dissolved in 2011.
[8] Previously included in the Grantor Trust. The Grantor Trust was dissolved in 2011.