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Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities $ 53,407 $ 54,935
Unrealized Gains, Available-for-sale securities 710 698
Unrealized Losses, Available-for-sale securities (529) (727)
Fair Value, Available-for-sale securities 53,588 54,906
Amortized Cost, Held-to-Maturity Securities 1,386 1,462
Non-Credit Loss Component of OTTI Securities, Held-to-Maturity Securities (101) (104)
Unrealized Gains, Held-to-Maturity Securities 148 141
Unrealized Losses, Held-to-Maturity Securities 0 0
Fair Value, Securities-held-to-maturity 1,433 1,499
U.S. Treasury [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 27,599 27,716
Unrealized Gains, Available-for-sale securities 388 391
Unrealized Losses, Available-for-sale securities (73) (113)
Fair Value, Available-for-sale securities 27,914 27,994
Mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 164 [1] 159 [1]
Unrealized Gains, Available-for-sale securities 0 [1] 0 [1]
Unrealized Losses, Available-for-sale securities (8) [1] (14) [1]
Fair Value, Available-for-sale securities 156 [1] 145 [1]
Amortized Cost, Held-to-Maturity Securities 805 [2] 845 [2]
Non-Credit Loss Component of OTTI Securities, Held-to-Maturity Securities 0 [2]  
Unrealized Gains, Held-to-Maturity Securities 84 [2] 88 [2]
Unrealized Losses, Held-to-Maturity Securities 0 [2] 0 [2]
Fair Value, Securities-held-to-maturity 889 [2] 933 [2]
Collateralized Mortgage Obligations [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 40 [1] 41 [1]
Unrealized Gains, Available-for-sale securities 0 [1] 0 [1]
Unrealized Losses, Available-for-sale securities (1) [1] (1) [1]
Fair Value, Available-for-sale securities 39 [1] 40 [1]
Direct agency obligations [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 4,107 [1] 4,115 [1]
Unrealized Gains, Available-for-sale securities 247 [1] 225 [1]
Unrealized Losses, Available-for-sale securities (12) [1] (16) [1]
Fair Value, Available-for-sale securities 4,342 [1] 4,324 [1]
Mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 10,280 10,304
Unrealized Gains, Available-for-sale securities 36 40
Unrealized Losses, Available-for-sale securities (239) (342)
Fair Value, Available-for-sale securities 10,077 10,002
Amortized Cost, Held-to-Maturity Securities 50 52
Non-Credit Loss Component of OTTI Securities, Held-to-Maturity Securities 0  
Unrealized Gains, Held-to-Maturity Securities 9 8
Unrealized Losses, Held-to-Maturity Securities 0 0
Fair Value, Securities-held-to-maturity 59 60
Mortgage-backed securities [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Fair Value, Securities-held-to-maturity 378 398
Mortgage-backed securities [Member] | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Fair Value, Securities-held-to-maturity 427 447
Collateralized mortgage obligations [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 5,210 6,584
Unrealized Gains, Available-for-sale securities 14 17
Unrealized Losses, Available-for-sale securities (121) (154)
Fair Value, Available-for-sale securities 5,103 6,447
Amortized Cost, Held-to-Maturity Securities 204 214
Non-Credit Loss Component of OTTI Securities, Held-to-Maturity Securities 0  
Unrealized Gains, Held-to-Maturity Securities 23 24
Unrealized Losses, Held-to-Maturity Securities 0 0
Fair Value, Securities-held-to-maturity 227 238
Obligations of U.S. states and political subdivision [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 741 755
Unrealized Gains, Available-for-sale securities 13 12
Unrealized Losses, Available-for-sale securities (17) (25)
Fair Value, Available-for-sale securities 737 742
Amortized Cost, Held-to-Maturity Securities 28 29
Non-Credit Loss Component of OTTI Securities, Held-to-Maturity Securities 0  
Unrealized Gains, Held-to-Maturity Securities 1 1
Unrealized Losses, Held-to-Maturity Securities 0 0
Fair Value, Securities-held-to-maturity 29 30
Residential mortgages [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 1 1
Unrealized Gains, Available-for-sale securities 0 0
Unrealized Losses, Available-for-sale securities 0 0
Fair Value, Available-for-sale securities 1 1
Amortized Cost, Held-to-Maturity Securities 18 18
Non-Credit Loss Component of OTTI Securities, Held-to-Maturity Securities 0  
Unrealized Gains, Held-to-Maturity Securities 1 1
Unrealized Losses, Held-to-Maturity Securities 0 0
Fair Value, Securities-held-to-maturity 19 19
Commercial mortgages [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 95 125
Unrealized Gains, Available-for-sale securities 1 1
Unrealized Losses, Available-for-sale securities 0 0
Fair Value, Available-for-sale securities 96 126
Home equity [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 253 263
Unrealized Gains, Available-for-sale securities 0 0
Unrealized Losses, Available-for-sale securities (33) (36)
Fair Value, Available-for-sale securities 220 227
Other [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 103 100
Unrealized Gains, Available-for-sale securities 0 0
Unrealized Losses, Available-for-sale securities (9) (6)
Fair Value, Available-for-sale securities 94 94
Foreign debt securities [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 4,649 [3] 4,607 [3]
Unrealized Gains, Available-for-sale securities 9 [3] 10 [3]
Unrealized Losses, Available-for-sale securities (12) [3] (15) [3]
Fair Value, Available-for-sale securities 4,646 [3] 4,602 [3]
Foreign debt securities [Member] | Foreign Government [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Foreign debt securities fully backed by foreign governments 1,232 1,101
Equity securities [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 165 165
Unrealized Gains, Available-for-sale securities 2 2
Unrealized Losses, Available-for-sale securities (4) (5)
Fair Value, Available-for-sale securities 163 162
Asset-backed securities collateralized by residential mortgages
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Held-to-Maturity Securities 281 [4] 304 [4]
Non-Credit Loss Component of OTTI Securities, Held-to-Maturity Securities (101) [4] (104) [4]
Unrealized Gains, Held-to-Maturity Securities 30 [4] 19 [4]
Unrealized Losses, Held-to-Maturity Securities 0 [4] 0 [4]
Fair Value, Securities-held-to-maturity 210 [4] 219 [4]
US Government agency issued or guaranteed [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities 171 167
US Government agency issued or guaranteed [Member] | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
   
Schedule of Available-for-sale Securities and Held-to-Maturity Securities [Line Items]    
Amortized Cost, Available-for-sale securities $ 33 $ 33
[1] Includes securities at amortized cost of $171 million and $167 million issued or guaranteed by FNMA at March 31, 2014 and December 31, 2013, respectively, and $33 million and $33 million issued or guaranteed by FHLMC at March 31, 2014 and December 31, 2013, respectively.
[2] Includes securities at amortized cost of $378 million and $398 million issued or guaranteed by FNMA at March 31, 2014 and December 31, 2013, respectively, and $427 million and $447 million issued and guaranteed by FHLMC at March 31, 2014 and December 31, 2013, respectively.
[3] At March 31, 2014 and December 31, 2013, foreign debt securities consisted of $1,232 million and $1,101 million, respectively, of securities fully backed by foreign governments. The remainder of foreign debt securities represents public sector entity, bank or corporate debt.
[4] Relates to securities held by Bryant Park Funding LLC ("Bryant Park"), a variable interest entity which was consolidated in the second quarter of 2013. See Note 16, "Variable Interest Entities" for additional information.