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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Assets:    
Available-for-sale securities, fair value [1] $ 27,987 $ 22,408
Trading securities 370 360
Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 27,386 [2] 21,808 [3]
Trading securities 370 360
Residential mortgage loans held for sale 628 561
Residential mortgage loans measured at FV 178 [4] 108 [5]
Derivative assets 2,111 2,080
Total assets 30,673 24,917
Liabilities:    
Derivative liabilities 1,001 1,043
Short positions 23 21
Total liabilities 1,024 1,064
Interest Rate Contract | Fair value, recurring    
Assets:    
Derivative assets 882 900
Liabilities:    
Derivative liabilities 282 284
Foreign Exchange Contract | Fair value, recurring    
Assets:    
Derivative assets 495 417
Liabilities:    
Derivative liabilities 441 372
Equity Contract | Fair value, recurring    
Assets:    
Derivative assets 500 415
Liabilities:    
Derivative liabilities 55 49
Commodity Contract | Fair value, recurring    
Assets:    
Derivative assets 234 348
Liabilities:    
Derivative liabilities 223 338
U.S. Treasury and federal agencies    
Assets:    
Available-for-sale securities, fair value 1,615 1,632
U.S. Treasury and federal agencies | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 1,615 1,632
Trading securities 9 14
Obligations of states and political subdivisions    
Assets:    
Available-for-sale securities, fair value 177 192
Obligations of states and political subdivisions | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 177 192
Trading securities 17 8
Agency mortgage-backed securities | Residential mortgage backed securities    
Assets:    
Available-for-sale securities, fair value 15,954 [6] 12,404 [7]
Agency mortgage-backed securities | Residential mortgage backed securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 15,954 12,404
Trading securities 4 9
Agency mortgage-backed securities | Commercial Mortgage Backed Securities [Member]    
Assets:    
Available-for-sale securities, fair value 5,751 4,565
Agency mortgage-backed securities | Commercial Mortgage Backed Securities [Member] | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 5,751 4,565
Non-agency mortgage-backed securities | Commercial Mortgage Backed Securities [Member]    
Assets:    
Available-for-sale securities, fair value 2,414 1,550
Non-agency mortgage-backed securities | Commercial Mortgage Backed Securities [Member] | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 2,414 1,550
Asset-backed securities and other debt securities    
Assets:    
Available-for-sale securities, fair value 1,374 1,362
Asset-backed securities and other debt securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 1,374 1,362
Trading securities 13 13
Equity securities    
Assets:    
Available-for-sale securities, fair value 702 [8] 703 [9]
Equity securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 101 [2] 103 [3]
Trading securities 327 316
Fair Value, Inputs, Level 1 | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 106 [2],[10] 109 [3],[11]
Trading securities 327 [10] 316 [11]
Derivative assets 39 [10] 68 [11]
Total assets 472 [10] 493 [11]
Liabilities:    
Derivative liabilities 21 [10] 64 [11]
Short positions 19 [10] 16 [11]
Total liabilities 40 [10] 80 [11]
Fair Value, Inputs, Level 1 | Interest Rate Contract | Fair value, recurring    
Assets:    
Derivative assets [10] 7  
Liabilities:    
Derivative liabilities 1 [10] 6 [11]
Fair Value, Inputs, Level 1 | Commodity Contract | Fair value, recurring    
Assets:    
Derivative assets 32 [10] 68 [11]
Liabilities:    
Derivative liabilities 20 [10] 58 [11]
Fair Value, Inputs, Level 1 | U.S. Treasury and federal agencies | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 25 [10] 25 [11]
Fair Value, Inputs, Level 1 | Equity securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 81 [2],[10] 84 [3],[11]
Trading securities 327 [10] 316 [11]
Fair Value, Inputs, Level 2 | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 27,280 [2],[10] 21,699 [3],[11]
Trading securities 43 [10] 44 [11]
Residential mortgage loans held for sale 628 [10] 561 [11]
Derivative assets 1,558 [10] 1,585 [11]
Total assets 29,509 [10] 23,889 [11]
Liabilities:    
Derivative liabilities 921 [10] 928 [11]
Short positions 4 [10] 5 [11]
Total liabilities 925 [10] 933 [11]
Fair Value, Inputs, Level 2 | Interest Rate Contract | Fair value, recurring    
Assets:    
Derivative assets 861 [10] 888 [11]
Liabilities:    
Derivative liabilities 277 [10] 276 [11]
Fair Value, Inputs, Level 2 | Foreign Exchange Contract | Fair value, recurring    
Assets:    
Derivative assets 495 [10] 417 [11]
Liabilities:    
Derivative liabilities 441 [10] 372 [11]
Fair Value, Inputs, Level 2 | Commodity Contract | Fair value, recurring    
Assets:    
Derivative assets 202 [10] 280 [11]
Liabilities:    
Derivative liabilities 203 [10] 280 [11]
Fair Value, Inputs, Level 2 | U.S. Treasury and federal agencies | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 1,590 [10] 1,607 [11]
Trading securities 9 [10] 14 [11]
Fair Value, Inputs, Level 2 | Obligations of states and political subdivisions | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 177 [10] 192 [11]
Trading securities 17 [10] 8 [11]
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities | Residential mortgage backed securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 15,954 [10] 12,404 [11]
Trading securities 4 [10] 9 [11]
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities | Commercial Mortgage Backed Securities [Member] | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 5,751 [10] 4,565 [11]
Fair Value, Inputs, Level 2 | Non-agency mortgage-backed securities | Commercial Mortgage Backed Securities [Member] | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 2,414 [10] 1,550 [11]
Fair Value, Inputs, Level 2 | Asset-backed securities and other debt securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 1,374 [10] 1,362 [11]
Trading securities 13 [10] 13 [11]
Fair Value, Inputs, Level 2 | Equity securities | Fair value, recurring    
Assets:    
Available-for-sale securities, fair value 20 [2],[10] 19 [3],[11]
Fair Value, Inputs, Level 3 | Fair value, recurring    
Assets:    
Residential mortgage loans measured at FV 178 [4] 108 [5]
Derivative assets 514 427
Total assets 692 535
Liabilities:    
Derivative liabilities 59 51
Total liabilities 59 51
Fair Value, Inputs, Level 3 | Interest Rate Contract | Fair value, recurring    
Assets:    
Derivative assets 14 12
Liabilities:    
Derivative liabilities 4 2
Fair Value, Inputs, Level 3 | Equity Contract | Fair value, recurring    
Assets:    
Derivative assets 500 415
Liabilities:    
Derivative liabilities $ 55 $ 49
[1] Amortized cost of $27,483 and $21,677 at June 30, 2015 and December 31, 2014, respectively.
[2] Excludes FHLB and FRB restricted stock totaling $248 and $353, respectively, at June 30, 2015.
[3] Excludes FHLB and FRB restricted stock totaling $248 and $352, respectively, at December 31, 2014.
[4] Includes residential mortgage loans originated as held for sale and subsequently transferred to held for investment.
[5] Includes residential mortgage loans originated as held for sale and subsequently transferred to held for investment.
[6] Includes interest-only mortgage-backed securities of $162 as of June 30, 2015 recorded at fair value with fair value changes recorded in securities gains, net, in the Condensed Consolidated Statements of Income.
[7] Includes interest-only mortgage-backed securities of $175 as of December 31, 2014, recorded at fair value with fair value changes recorded in securities gains, net, in the Condensed Consolidated Statements of Income.
[8] Equity securities consist of FHLB and FRB restricted stock holdings of $248 and $353, respectively, at June 30, 2015, that are carried at cost, and certain mutual fund and equity security holdings.
[9] Equity securities consist of FHLB and FRB restricted stock holdings of $248 and $352, respectively, at December 31, 2014, that are carried at cost, and certain mutual fund and equity security holdings
[10] During the three and six months ended June 30, 2015, no assets or liabilities were transferred between Level 1 and Level 2
[11] During the year ended December 31, 2014, no assets or liabilities were transferred between Level 1 and Level 2.