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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 359,223 $ 320,929
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 299,698 362,306
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 41,151,310 [1] 30,272,764 [2]
Derivative Liabilities, Notional 41,993,255 [1] 33,838,893 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 613,953 571,793
Derivative Assets, Netting Adjustments (243,077) (135,530)
Derivative Assets, Net Fair Value Before Cash Collateral 370,876 436,263
Derivative Assets, Cash Collateral (11,653) (115,334)
Derviative contracts, net of cash collateral, Assets, Fair value 359,223 320,929
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 621,558 574,347
Derivative Liabilities, Netting Adjustments (243,077) (135,530)
Derivative Liabilities, Net Fair Value Before Cash Collateral 378,481 438,817
Derivative Liabilities, Cash Collateral (78,783) (76,511)
Derivative Liabilities, Fair Value, Net of Cash Collateral 299,698 362,306
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 15,222,594 [1] 14,362,776 [2]
Derivative Liabilities, Notional 14,951,483 [1] 14,204,251 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 480,979 521,383
Derivative Assets, Netting Adjustments (126,825) (94,659)
Derivative Assets, Net Fair Value Before Cash Collateral 354,154 426,724
Derivative Assets, Cash Collateral (11,653) (115,334)
Derviative contracts, net of cash collateral, Assets, Fair value 342,501 311,390
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 469,872 507,925
Derivative Liabilities, Netting Adjustments (126,825) (94,659)
Derivative Liabilities, Net Fair Value Before Cash Collateral 343,047 413,266
Derivative Liabilities, Cash Collateral (75,246) (69,196)
Derivative Liabilities, Fair Value, Net of Cash Collateral 267,801 344,070
Not Designated as Hedging Instrument [Member] | To-be-announced residential mortgage-backed securities [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 11,338,256 [1] 10,671,151 [2]
Derivative Liabilities, Notional 11,140,756 [1] 10,558,151 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 91,727 92,231
Derivative Assets, Netting Adjustments (33,983) (26,787)
Derivative Assets, Net Fair Value Before Cash Collateral 57,744 65,444
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 57,744 65,444
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 89,929 90,388
Derivative Liabilities, Netting Adjustments (33,983) (26,787)
Derivative Liabilities, Net Fair Value Before Cash Collateral 55,946 63,601
Derivative Liabilities, Cash Collateral (55,879) (63,596)
Derivative Liabilities, Fair Value, Net of Cash Collateral 67 5
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 2,047,117 [1] 1,924,131 [2]
Derivative Liabilities, Notional 2,047,117 [1] 1,924,131 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 36,602 36,112
Derivative Assets, Netting Adjustments (8,296) (6,688)
Derivative Assets, Net Fair Value Before Cash Collateral 28,306 29,424
Derivative Assets, Cash Collateral (593) (7,934)
Derviative contracts, net of cash collateral, Assets, Fair value 27,713 21,490
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 36,644 36,288
Derivative Liabilities, Netting Adjustments (8,296) (6,688)
Derivative Liabilities, Net Fair Value Before Cash Collateral 28,348 29,600
Derivative Liabilities, Cash Collateral (14,345) (4,110)
Derivative Liabilities, Fair Value, Net of Cash Collateral 14,003 25,490
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 1,501,876 [1] 1,472,209 [2]
Derivative Liabilities, Notional 1,433,137 [1] 1,434,247 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 123,485 206,418
Derivative Assets, Netting Adjustments (84,482) (60,983)
Derivative Assets, Net Fair Value Before Cash Collateral 39,003 145,435
Derivative Assets, Cash Collateral (10,130) (106,752)
Derviative contracts, net of cash collateral, Assets, Fair value 28,873 38,683
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 119,097 202,494
Derivative Liabilities, Netting Adjustments (84,482) (60,983)
Derivative Liabilities, Net Fair Value Before Cash Collateral 34,615 141,511
Derivative Liabilities, Cash Collateral (4,608) (1,490)
Derivative Liabilities, Fair Value, Net of Cash Collateral 30,007 140,021
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 23,660 [1] 21,210 [2]
Derivative Liabilities, Notional 23,636 [1] 21,214 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 2,696 842
Derivative Assets, Netting Adjustments (64) (201)
Derivative Assets, Net Fair Value Before Cash Collateral 2,632 641
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 2,632 641
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 2,662 812
Derivative Liabilities, Netting Adjustments (64) (201)
Derivative Liabilities, Net Fair Value Before Cash Collateral 2,598 611
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 2,598 611
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 224,741 [1] 184,990 [2]
Derivative Liabilities, Notional 219,893 [1] 177,423 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 223,329 183,759
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 223,329 183,759
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 223,329 183,759
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 218,400 175,922
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 218,400 175,922
Derivative Liabilities, Cash Collateral (414) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 217,986 175,922
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 86,944 [1] 89,085 [2]
Derivative Liabilities, Notional 86,944 [1] 89,085 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 3,140 2,021
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 3,140 2,021
Derivative Assets, Cash Collateral (930) (648)
Derviative contracts, net of cash collateral, Assets, Fair value 2,210 1,373
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 3,140 2,021
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 3,140 2,021
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 3,140 2,021
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 25,928,716 [1] 15,909,988 [2]
Derivative Liabilities, Notional 27,041,772 [1] 19,634,642 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 132,974 50,410
Derivative Assets, Netting Adjustments (116,252) (40,871)
Derivative Assets, Net Fair Value Before Cash Collateral 16,722 9,539
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 16,722 9,539
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 151,686 66,422
Derivative Liabilities, Netting Adjustments (116,252) (40,871)
Derivative Liabilities, Net Fair Value Before Cash Collateral 35,434 25,551
Derivative Liabilities, Cash Collateral (3,537) (7,315)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 31,897 $ 18,236
[1] Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.
[2] Notional amounts for commodity contracts are converted into dollar-equivalent amounts based on dollar prices at the inception of the contract.