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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Assets:    
Available-for-sale securities, fair value [1] $ 30,689 $ 29,044
Trading securities 431 386
Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 30,083 [2] 28,440 [3]
Trading securities 431 386
Residential mortgage loans held for sale 954 519
Residential mortgage loans measured at FV [4] 149 167
Derivative assets [5] 1,890 1,852
Total assets 33,507 31,364
Liabilities:    
Derivative liabilities [6] 792 938
Short positions [6] 19 29
Total liabilities 811 967
Interest Rate Contract | Fair value, recurring    
Assets:    
Derivative assets 1,260 910
Liabilities:    
Derivative liabilities 404 261
Foreign Exchange Contract | Fair value, recurring    
Assets:    
Derivative assets 194 386
Liabilities:    
Derivative liabilities 186 340
Equity Contract | Fair value, recurring    
Assets:    
Derivative assets 325 262
Liabilities:    
Derivative liabilities 103 61
Commodity Contract | Fair value, recurring    
Assets:    
Derivative assets 111 294
Liabilities:    
Derivative liabilities 99 276
U.S. Treasury and federal agencies    
Assets:    
Available-for-sale securities, fair value 881 1,187
U.S. Treasury and federal agencies | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 881 1,187
Trading securities 9 19
Obligations of states and political subdivisions    
Assets:    
Available-for-sale securities, fair value 52 52
Obligations of states and political subdivisions | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 52 52
Trading securities 42 9
Agency mortgage-backed securities | Residential mortgage backed securities    
Assets:    
Available-for-sale securities, fair value 15,188 [7] 15,081 [8]
Agency mortgage-backed securities | Residential mortgage backed securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 15,188 15,081
Trading securities 13 6
Agency mortgage-backed securities | Commercial mortgage backed securities    
Assets:    
Available-for-sale securities, fair value 8,950 7,862
Agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 8,950 7,862
Non-agency mortgage-backed securities | Commercial mortgage backed securities    
Assets:    
Available-for-sale securities, fair value 2,834 2,804
Non-agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 2,834 2,804
Asset-backed securities and other debt securities    
Assets:    
Available-for-sale securities, fair value 2,083 1,355
Asset-backed securities and other debt securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 2,083 1,355
Trading securities 30 19
Equity securities    
Assets:    
Available-for-sale securities, fair value 701 [9] 703 [10]
Equity securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 95 [2] 99 [3]
Trading securities 337 333
Fair Value, Inputs, Level 1 | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 171 [2],[11] 198 [3],[12]
Trading securities 337 [11] 333 [12]
Derivative assets [5] 17 [11] 57 [12]
Total assets 525 [11] 588 [12]
Liabilities:    
Derivative liabilities [6] 21 [11] 38 [12]
Short positions [6] 15 [11] 22 [12]
Total liabilities 36 [11] 60 [12]
Fair Value, Inputs, Level 1 | Interest Rate Contract | Fair value, recurring    
Assets:    
Derivative assets 0 3 [12]
Liabilities:    
Derivative liabilities 8 [11] 1 [12]
Fair Value, Inputs, Level 1 | Commodity Contract | Fair value, recurring    
Assets:    
Derivative assets 17 [11] 54 [12]
Liabilities:    
Derivative liabilities 13 [11] 37 [12]
Fair Value, Inputs, Level 1 | U.S. Treasury and federal agencies | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 77 [11] 100 [12]
Fair Value, Inputs, Level 1 | Equity securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 94 [2],[11] 98 [3],[12]
Trading securities 337 [11] 333 [12]
Fair Value, Inputs, Level 2 | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 29,912 [2],[11] 28,242 [3],[12]
Trading securities 94 [11] 53 [12]
Residential mortgage loans held for sale 954 [11] 519 [12]
Derivative assets [5] 1,515 [11] 1,518 [12]
Total assets 32,475 [11] 30,332 [12]
Liabilities:    
Derivative liabilities [6] 664 [11] 836 [12]
Short positions [6] 4 [11] 7 [12]
Total liabilities 668 [11] 843 [12]
Fair Value, Inputs, Level 2 | Interest Rate Contract | Fair value, recurring    
Assets:    
Derivative assets 1,227 [11] 892 [12]
Liabilities:    
Derivative liabilities 392 [11] 257 [12]
Fair Value, Inputs, Level 2 | Foreign Exchange Contract | Fair value, recurring    
Assets:    
Derivative assets 194 [11] 386 [12]
Liabilities:    
Derivative liabilities 186 [11] 340 [12]
Fair Value, Inputs, Level 2 | Commodity Contract | Fair value, recurring    
Assets:    
Derivative assets 94 [11] 240 [12]
Liabilities:    
Derivative liabilities 86 [11] 239 [12]
Fair Value, Inputs, Level 2 | U.S. Treasury and federal agencies | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 804 [11] 1,087 [12]
Trading securities 9 [11] 19 [12]
Fair Value, Inputs, Level 2 | Obligations of states and political subdivisions | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 52 [11] 52 [12]
Trading securities 42 [11] 9 [12]
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities | Residential mortgage backed securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 15,188 [11] 15,081 [12]
Trading securities 13 [11] 6 [12]
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 8,950 [11] 7,862 [12]
Fair Value, Inputs, Level 2 | Non-agency mortgage-backed securities | Commercial mortgage backed securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 2,834 [11] 2,804 [12]
Fair Value, Inputs, Level 2 | Asset-backed securities and other debt securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 2,083 [11] 1,355 [12]
Trading securities 30 [11] 19 [12]
Fair Value, Inputs, Level 2 | Equity securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 1 [2],[11] 1 [3],[12]
Fair Value, Inputs, Level 3 | Fair value, recurring    
Assets:    
Residential mortgage loans measured at FV [4] 149 167
Derivative assets [5] 358 277
Total assets 507 444
Liabilities:    
Derivative liabilities [6] 107 64
Total liabilities 107 64
Fair Value, Inputs, Level 3 | Interest Rate Contract | Fair value, recurring    
Assets:    
Derivative assets 33 15
Liabilities:    
Derivative liabilities 4 3
Fair Value, Inputs, Level 3 | Equity Contract | Fair value, recurring    
Assets:    
Derivative assets 325 262
Liabilities:    
Derivative liabilities $ 103 $ 61
[1] Amortized cost of $ 29,486 and $ 28,678 at September 30, 2016 and Dec ember 31, 2015 , respectively.
[2] Excludes FHLB, FRB and DTCC restricted stock holdings totaling $ 248 , $ 357 and $ 1 , respectively, at September 30, 2016 .
[3] Excludes FHLB and FRB restricted stock totaling $ 248 , $ 355 and $ 1 , respectively, at December 31, 2015 .
[4] Includes residential mortgage loans originated as held for sale and subsequently transferred to held for investment.
[5] Included in other assets in the Condensed Consolidated Balance Sheets.
[6] Included in other liabilities in the Condens ed Consolidated Balance Sheets.
[7] Includes interest-only mortgage- backed securities of $ 33 as of September 30, 2016 , recorded at fair value with fair value changes re corded in securities gains, net , in the Condensed Consolidated Statement s of Income.
[8] Includes interest-only mortgage- backed securities of $ 50 as of December 31, 2015 , recorded at fair value with fair value changes re corded in securities gains, net , in the Condensed Consolidated Statement s of Income.
[9] Equity securities consist of FHLB, FRB and DTCC restricted stock holdings of $ 248 , $ 357 and $ 1 , respectively , at September 30, 2016 , that are carried at cost, and certain mutual fund and equity security holdings.
[10] Equity securities consist of FHLB, FRB and DTCC restricted stock holdings of $ 248 , $ 355 , and $ 1 , respectively, at December 31, 2015 , that are carried at cost, and certain mutual fund and equity security holdings
[11] During both the three and nine months ended September 30, 2016 , no assets or liabilities were transferred between Level 1 and Level 2.
[12] During the year ended December 31, 2015 , no assets or liabilities were transferred between Level 1 and Level 2.