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Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Fair Value Of Other Financial Instrument [Line Items]      
Derivatives $ 3,740 $ 5,004  
Loans and Leases Receivable, Net Amount 67,215 72,858 $ 78,747
Derivatives 3,616 4,535  
Level 1 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 992 1,235  
Federal Funds Sold and Securities Purchased under Agreements to Resell 0 0  
Federal funds sold and securities purchased under agreements to resell designated under fair value option 0 0  
Non-derivative trading assets 5,081 3,560  
Derivatives 11 12  
Securities 20,873 25,145  
Short-term financial liabilities 0 0  
Deposits designated under fair value option 0 0  
Non-derivative trading liabilities 980 1,060  
Derivatives 13 8  
Short-term borrowings designated under fair value option 0 0  
Long-term debt 0 0  
Long-term debt designated under fair value option 0 0  
Level 1 [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Commercial loans designated under fair value option and held for sale 0 0  
Loans held for sale 0 0  
Level 1 [Member] | Consumer Loans [Member] | Residential mortgages and home equity mortgages [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 1 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 0 0  
Level 1 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 0 0  
Level 2 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 30,146 20,238  
Federal Funds Sold and Securities Purchased under Agreements to Resell 17,722 29,253  
Federal funds sold and securities purchased under agreements to resell designated under fair value option 864 770  
Non-derivative trading assets 9,955 5,811  
Derivatives 3,704 4,961  
Securities 24,813 24,498  
Short-term financial liabilities 6,095 2,462  
Deposits designated under fair value option 6,345 6,119  
Non-derivative trading liabilities 41 62  
Derivatives 3,589 4,511  
Short-term borrowings designated under fair value option 2,818 2,672  
Long-term debt 26,519 28,093  
Long-term debt designated under fair value option 11,384 9,885  
Level 2 [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Commercial loans designated under fair value option and held for sale 389 725  
Loans held for sale 231 119  
Level 2 [Member] | Consumer Loans [Member] | Residential mortgages and home equity mortgages [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 6 9  
Level 2 [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 0 0  
Level 2 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 100,675 112,009  
Level 2 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 9,001 9,749  
Level 3 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 30 27  
Federal Funds Sold and Securities Purchased under Agreements to Resell 0 0  
Federal funds sold and securities purchased under agreements to resell designated under fair value option 0 0  
Non-derivative trading assets 1,934 3,068  
Derivatives 25 31  
Securities 107 105  
Short-term financial liabilities 30 27  
Deposits designated under fair value option 1,142 1,407  
Non-derivative trading liabilities 0 0  
Derivatives 14 16  
Short-term borrowings designated under fair value option 0 0  
Long-term debt 0 0  
Long-term debt designated under fair value option 541 499  
Level 3 [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Commercial loans designated under fair value option and held for sale 0 0  
Loans held for sale 0 0  
Level 3 [Member] | Consumer Loans [Member] | Residential mortgages and home equity mortgages [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 75 903  
Level 3 [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 67 71  
Level 3 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 0 0  
Level 3 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 0 0  
Carrying Value [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 31,168 21,500  
Federal Funds Sold and Securities Purchased under Agreements to Resell 17,722 29,253  
Federal funds sold and securities purchased under agreements to resell designated under fair value option 864 770  
Non-derivative trading assets 16,970 12,439  
Derivatives 3,740 5,004  
Securities 45,749 49,719  
Short-term financial liabilities 6,094 2,456  
Deposits designated under fair value option 7,487 7,526  
Non-derivative trading liabilities 1,021 1,122  
Derivatives 3,616 4,535  
Short-term borrowings designated under fair value option 2,818 2,672  
Long-term debt 25,520 27,355  
Long-term debt designated under fair value option 11,925 10,384  
Carrying Value [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Commercial loans designated under fair value option and held for sale 389 725  
Loans held for sale 231 119  
Carrying Value [Member] | Consumer Loans [Member] | Residential mortgages and home equity mortgages [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 78 894  
Carrying Value [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 67 71  
Carrying Value [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 100,675 112,009  
Carrying Value [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 8,981 9,713  
Estimate of fair value [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 31,168 21,500  
Federal Funds Sold and Securities Purchased under Agreements to Resell 17,722 29,253  
Federal funds sold and securities purchased under agreements to resell designated under fair value option 864 770  
Non-derivative trading assets 16,970 12,439  
Derivatives 3,740 5,004  
Securities 45,793 49,748  
Short-term financial liabilities 6,125 2,489  
Deposits designated under fair value option 7,487 7,526  
Non-derivative trading liabilities 1,021 1,122  
Derivatives 3,616 4,535  
Short-term borrowings designated under fair value option 2,818 2,672  
Long-term debt 26,519 28,093  
Long-term debt designated under fair value option 11,925 10,384  
Estimate of fair value [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Commercial loans designated under fair value option and held for sale 389 725  
Loans held for sale 231 119  
Estimate of fair value [Member] | Consumer Loans [Member] | Residential mortgages and home equity mortgages [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 81 912  
Estimate of fair value [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 67 71  
Estimate of fair value [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 100,675 112,009  
Estimate of fair value [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 9,001 9,749  
Commercial Portfolio Segment [Member] | Level 1 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 0 0  
Commercial Portfolio Segment [Member] | Level 2 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 0 0  
Commercial Portfolio Segment [Member] | Level 3 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 49,561 54,938  
Commercial Portfolio Segment [Member] | Carrying Value [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 47,807 53,286  
Commercial Portfolio Segment [Member] | Estimate of fair value [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 49,561 54,938  
Other consumer [Member] | Level 1 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 0 0  
Other consumer [Member] | Level 2 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 0 0  
Other consumer [Member] | Level 3 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 18,734 18,833  
Other consumer [Member] | Carrying Value [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount 19,408 19,572  
Other consumer [Member] | Estimate of fair value [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans and Leases Receivable, Net Amount $ 18,734 $ 18,833