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Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value Of Other Financial Instrument [Line Items]    
Securities purchased under resale agreements $ 1,352 $ 2,119
Commercial loans designated under fair value option and held for sale 753 58
Loans held for sale 969 230
Deposits designated under fair value option 7,637 7,740
Long-term debt designated under fair value option 7,700 7,600
Commercial Loan [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 864 76
Consumer Loans [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 105 154
Consumer Loans [Member] | Residential Mortgage [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 42 91
Consumer Loans [Member] | Other consumer [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 63 63
Level 1 [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 1,155 961
Securities purchased under resale agreements 0 0
Non-derivative trading assets 2,140 1,344
Derivatives 13 26
Securities 39,153 39,553
Commercial loans, net of allowance for credit losses 0 0
Commercial loans designated under fair value option and held for sale 0 0
Consumer loans, net of allowance for credit losses 0 0
Short-term financial liabilities 0 0
Deposits without fixed maturities 0 0
Deposits with fixed maturities 0 0
Deposits designated under fair value option 0 0
Non-derivative trading liabilities 367 308
Derivatives 5 5
Long-term debt 0 0
Long-term debt designated under fair value option 0 0
Level 1 [Member] | Commercial Loan [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 0 0
Level 1 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 0 0
Level 1 [Member] | Consumer Loans [Member] | Other consumer [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 0 0
Level 2 [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 23,466 19,614
Securities purchased under resale agreements 1,352 2,119
Non-derivative trading assets 18,025 18,924
Derivatives 5,391 7,467
Securities 15,868 16,852
Commercial loans, net of allowance for credit losses 0 0
Commercial loans designated under fair value option and held for sale 753 58
Consumer loans, net of allowance for credit losses 68 492
Short-term financial liabilities 28,785 19,154
Deposits without fixed maturities 95,950 102,584
Deposits with fixed maturities 1,949 2,289
Deposits designated under fair value option 5,393 5,406
Non-derivative trading liabilities 3,993 3,826
Derivatives 5,611 7,294
Long-term debt 15,805 15,729
Long-term debt designated under fair value option 6,959 6,686
Level 2 [Member] | Commercial Loan [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 111 18
Level 2 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 14 36
Level 2 [Member] | Consumer Loans [Member] | Other consumer [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 0 0
Level 3 [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 43 51
Securities purchased under resale agreements 0 0
Non-derivative trading assets 3,183 2,635
Derivatives 52 76
Securities 0 0
Commercial loans, net of allowance for credit losses 51,156 49,897
Commercial loans designated under fair value option and held for sale 0 0
Consumer loans, net of allowance for credit losses 16,321 15,559
Short-term financial liabilities 42 51
Deposits without fixed maturities 0 0
Deposits with fixed maturities 0 0
Deposits designated under fair value option 2,244 2,334
Non-derivative trading liabilities 0 0
Derivatives 32 49
Long-term debt 0 0
Long-term debt designated under fair value option 732 900
Level 3 [Member] | Commercial Loan [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 0 0
Level 3 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 29 56
Level 3 [Member] | Consumer Loans [Member] | Other consumer [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 63 63
Carrying Value [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 24,664 20,626
Securities purchased under resale agreements 1,352 2,119
Non-derivative trading assets 23,348 22,903
Derivatives 5,456 7,569
Securities 54,974 56,368
Commercial loans, net of allowance for credit losses 49,585 48,186
Commercial loans designated under fair value option and held for sale 753 58
Consumer loans, net of allowance for credit losses 18,738 18,903
Short-term financial liabilities 28,827 19,205
Deposits without fixed maturities 95,950 102,584
Deposits with fixed maturities 1,944 2,284
Deposits designated under fair value option 7,637 7,740
Non-derivative trading liabilities 4,360 4,134
Derivatives 5,648 7,348
Long-term debt 15,262 15,261
Long-term debt designated under fair value option 7,691 7,586
Carrying Value [Member] | Commercial Loan [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 111 18
Carrying Value [Member] | Consumer Loans [Member] | Residential Mortgage [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 42 91
Carrying Value [Member] | Consumer Loans [Member] | Other consumer [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 63 63
Estimate of fair value [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 24,664 20,626
Securities purchased under resale agreements 1,352 2,119
Non-derivative trading assets 23,348 22,903
Derivatives 5,456 7,569
Securities 55,021 56,405
Commercial loans, net of allowance for credit losses 51,156 49,897
Commercial loans designated under fair value option and held for sale 753 58
Consumer loans, net of allowance for credit losses 16,389 16,051
Short-term financial liabilities 28,827 19,205
Deposits without fixed maturities 95,950 102,584
Deposits with fixed maturities 1,949 2,289
Deposits designated under fair value option 7,637 7,740
Non-derivative trading liabilities 4,360 4,134
Derivatives 5,648 7,348
Long-term debt 15,805 15,729
Long-term debt designated under fair value option 7,691 7,586
Estimate of fair value [Member] | Commercial Loan [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 111 18
Estimate of fair value [Member] | Consumer Loans [Member] | Residential Mortgage [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 43 92
Estimate of fair value [Member] | Consumer Loans [Member] | Other consumer [Member]
   
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale $ 63 $ 63