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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Assets:      
Available-for-sale debt securities, fair value [1] $ 31,808 $ 31,751  
Trading debt securities 269 492  
Equity securities 500 439  
Loans measured at FV 1,010   $ 848
Total assets 314   484
Commercial      
Assets:      
Loans held for sale measured at FV 6 0  
Residential Mortgage Loans      
Assets:      
Loans measured at FV 172 137  
Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 31,257 31,139  
Trading debt securities 269 492  
Equity securities 500 439  
Residential mortgage loans held for sale 563 399  
Loans measured at FV 172 137  
Loans held for sale measured at FV 6    
Mortgage servicing rights 1,010 858  
Derivative assets 984 823  
Total assets 34,761 34,287  
Liabilities:      
Derivative liabilities 913 602  
Short positions (98) (31)  
Total liabilities 1,011 633  
Interest Rate Contract | Fair value, recurring      
Assets:      
Derivative assets 545 514  
Liabilities:      
Derivative liabilities 363 178  
Foreign Exchange Contract | Fair value, recurring      
Assets:      
Derivative assets 124 124  
Liabilities:      
Derivative liabilities 110 120  
Equity Contract | Fair value, recurring      
Assets:      
Derivative assets   20  
Liabilities:      
Derivative liabilities 144 137  
Commodity Contract | Fair value, recurring      
Assets:      
Derivative assets 315 165  
Liabilities:      
Derivative liabilities 296 167  
U.S. Treasury and federal agencies      
Assets:      
Available-for-sale debt securities, fair value 95 98  
U.S. Treasury and federal agencies | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 95 98  
Trading debt securities 20 12  
Obligations of states and political subdivisions      
Assets:      
Available-for-sale debt securities, fair value 2 44  
Obligations of states and political subdivisions | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 2 44  
Trading debt securities 69 22  
Agency mortgage-backed securities | Residential mortgage backed securities      
Assets:      
Available-for-sale debt securities, fair value 15,973 15,319 [2]  
Agency mortgage-backed securities | Residential mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 15,973 15,319  
Trading debt securities 63 395  
Agency mortgage-backed securities | Commercial mortgage backed securities      
Assets:      
Available-for-sale debt securities, fair value 10,046 10,167  
Agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 10,046 10,167  
Non-agency mortgage-backed securities | Commercial mortgage backed securities      
Assets:      
Available-for-sale debt securities, fair value 3,097 3,293  
Non-agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 3,097 3,293  
Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt securities, fair value 2,044 2,218  
Asset-backed securities and other debt securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 2,044 2,218  
Trading debt securities 117 63  
Fair Value, Inputs, Level 1 | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 95 98  
Trading debt securities 5 1  
Equity securities 499 438  
Residential mortgage loans held for sale 0 0  
Loans measured at FV 0 0  
Loans held for sale measured at FV 0    
Mortgage servicing rights 0 0  
Derivative assets 38 40  
Total assets 637 577  
Liabilities:      
Derivative liabilities 104 39  
Short positions (47) (25)  
Total liabilities 151 64  
Fair Value, Inputs, Level 1 | Interest Rate Contract | Fair value, recurring      
Assets:      
Derivative assets 4 1  
Liabilities:      
Derivative liabilities 0 1  
Fair Value, Inputs, Level 1 | Foreign Exchange Contract | Fair value, recurring      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 1 | Equity Contract | Fair value, recurring      
Assets:      
Derivative assets   0  
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 1 | Commodity Contract | Fair value, recurring      
Assets:      
Derivative assets 34 39  
Liabilities:      
Derivative liabilities 104 38  
Fair Value, Inputs, Level 1 | U.S. Treasury and federal agencies | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 95 98  
Trading debt securities 5 1  
Fair Value, Inputs, Level 1 | Obligations of states and political subdivisions | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Fair Value, Inputs, Level 1 | Agency mortgage-backed securities | Residential mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Fair Value, Inputs, Level 1 | Agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Fair Value, Inputs, Level 1 | Non-agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Fair Value, Inputs, Level 1 | Asset-backed securities and other debt securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Fair Value, Inputs, Level 2      
Assets:      
Total assets 69   0
Fair Value, Inputs, Level 2 | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 31,162 31,041  
Trading debt securities 264 491  
Equity securities 1 1  
Residential mortgage loans held for sale 563 399  
Loans measured at FV 0 0  
Loans held for sale measured at FV 6    
Mortgage servicing rights 0 0  
Derivative assets 939 775  
Total assets 32,935 32,707  
Liabilities:      
Derivative liabilities 657 421  
Short positions (51) (6)  
Total liabilities 708 427  
Fair Value, Inputs, Level 2 | Interest Rate Contract | Fair value, recurring      
Assets:      
Derivative assets 534 505  
Liabilities:      
Derivative liabilities 355 172  
Fair Value, Inputs, Level 2 | Foreign Exchange Contract | Fair value, recurring      
Assets:      
Derivative assets 124 124  
Liabilities:      
Derivative liabilities 110 120  
Fair Value, Inputs, Level 2 | Equity Contract | Fair value, recurring      
Assets:      
Derivative assets   20  
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 2 | Commodity Contract | Fair value, recurring      
Assets:      
Derivative assets 281 126  
Liabilities:      
Derivative liabilities 192 129  
Fair Value, Inputs, Level 2 | U.S. Treasury and federal agencies | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 15 11  
Fair Value, Inputs, Level 2 | Obligations of states and political subdivisions | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 2 44  
Trading debt securities 69 22  
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities | Residential mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 15,973 15,319  
Trading debt securities 63 395  
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 10,046 10,167  
Fair Value, Inputs, Level 2 | Non-agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 3,097 3,293  
Fair Value, Inputs, Level 2 | Asset-backed securities and other debt securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 2,044 2,218  
Trading debt securities 117 63  
Fair Value, Inputs, Level 3      
Assets:      
Total assets 245   $ 484
Fair Value, Inputs, Level 3 | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Equity securities 0 0  
Residential mortgage loans held for sale 0 0  
Loans measured at FV 172 137  
Loans held for sale measured at FV 0    
Mortgage servicing rights 1,010 858  
Derivative assets 7 8  
Total assets 1,189 1,003  
Liabilities:      
Derivative liabilities 152 142  
Short positions 0 0  
Total liabilities 152 142  
Fair Value, Inputs, Level 3 | Interest Rate Contract | Fair value, recurring      
Assets:      
Derivative assets 7 8  
Liabilities:      
Derivative liabilities 8 5  
Fair Value, Inputs, Level 3 | Foreign Exchange Contract | Fair value, recurring      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 3 | Equity Contract | Fair value, recurring      
Assets:      
Derivative assets   0  
Liabilities:      
Derivative liabilities 144 137  
Fair Value, Inputs, Level 3 | Commodity Contract | Fair value, recurring      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 3 | U.S. Treasury and federal agencies | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Fair Value, Inputs, Level 3 | Obligations of states and political subdivisions | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Fair Value, Inputs, Level 3 | Agency mortgage-backed securities | Residential mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Fair Value, Inputs, Level 3 | Agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Fair Value, Inputs, Level 3 | Non-agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Fair Value, Inputs, Level 3 | Asset-backed securities and other debt securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities $ 0 $ 0  
[1]
  • Amortized cost of $ 32,707 and $ 31,577 at September 30, 2018 and December 31, 2017 , respectively.
[2]

Includes interest-only mortgage-backed securities of $ 34 as of December 31, 2017 , recorded at fair value with fair value changes recorded in securities (losses) gains, net, in the Condensed Consolidated Statements of Income.