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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 352,019 $ 320,929
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 336,791 362,306
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 78,780,596 [1] 30,272,764 [2]
Derivative Liabilities, Notional 80,366,050 [1] 33,838,893 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 675,084 571,793
Derivative Assets, Netting Adjustments (255,979) (135,530)
Derivative Assets, Net Fair Value Before Cash Collateral 419,105 436,263
Derivative Assets, Cash Collateral (67,086) (115,334)
Derviative contracts, net of cash collateral, Assets, Fair value 352,019 320,929
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 657,258 574,347
Derivative Liabilities, Netting Adjustments (255,979) (135,530)
Derivative Liabilities, Net Fair Value Before Cash Collateral 401,279 438,817
Derivative Liabilities, Cash Collateral (64,488) (76,511)
Derivative Liabilities, Fair Value, Net of Cash Collateral 336,791 362,306
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 4,688,107 [1] 14,362,776 [2]
Derivative Liabilities, Notional 4,634,911 [1] 14,204,251 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 460,859 521,383
Derivative Assets, Netting Adjustments (59,681) (94,659)
Derivative Assets, Net Fair Value Before Cash Collateral 401,178 426,724
Derivative Assets, Cash Collateral (67,086) (115,334)
Derviative contracts, net of cash collateral, Assets, Fair value 334,092 311,390
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 444,281 507,925
Derivative Liabilities, Netting Adjustments (59,681) (94,659)
Derivative Liabilities, Net Fair Value Before Cash Collateral 384,600 413,266
Derivative Liabilities, Cash Collateral (62,780) (69,196)
Derivative Liabilities, Fair Value, Net of Cash Collateral 321,820 344,070
Not Designated as Hedging Instrument [Member] | To-be-announced residential mortgage-backed securities [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 0 10,671,151
Derivative Liabilities, Notional 0 10,558,151
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 0 92,231
Derivative Assets, Netting Adjustments 0 (26,787)
Derivative Assets, Net Fair Value Before Cash Collateral 0 65,444
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 0 65,444
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 0 90,388
Derivative Liabilities, Netting Adjustments 0 (26,787)
Derivative Liabilities, Net Fair Value Before Cash Collateral 0 63,601
Derivative Liabilities, Cash Collateral 0 (63,596)
Derivative Liabilities, Fair Value, Net of Cash Collateral 0 5
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 2,399,788 1,924,131
Derivative Liabilities, Notional 2,399,788 1,924,131
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 67,157 36,112
Derivative Assets, Netting Adjustments (240) (6,688)
Derivative Assets, Net Fair Value Before Cash Collateral 66,917 29,424
Derivative Assets, Cash Collateral (277) (7,934)
Derviative contracts, net of cash collateral, Assets, Fair value 66,640 21,490
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 67,296 36,288
Derivative Liabilities, Netting Adjustments (240) (6,688)
Derivative Liabilities, Net Fair Value Before Cash Collateral 67,056 29,600
Derivative Liabilities, Cash Collateral (61,563) (4,110)
Derivative Liabilities, Fair Value, Net of Cash Collateral 5,493 25,490
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 1,980,406 1,472,209
Derivative Liabilities, Notional 1,936,369 1,434,247
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 183,204 206,418
Derivative Assets, Netting Adjustments (59,139) (60,983)
Derivative Assets, Net Fair Value Before Cash Collateral 124,065 145,435
Derivative Assets, Cash Collateral (66,149) (106,752)
Derviative contracts, net of cash collateral, Assets, Fair value 57,916 38,683
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 175,613 202,494
Derivative Liabilities, Netting Adjustments (59,139) (60,983)
Derivative Liabilities, Net Fair Value Before Cash Collateral 116,474 141,511
Derivative Liabilities, Cash Collateral (784) (1,490)
Derivative Liabilities, Fair Value, Net of Cash Collateral 115,690 140,021
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 15,538 21,210
Derivative Liabilities, Notional 15,547 21,214
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 470 842
Derivative Assets, Netting Adjustments (302) (201)
Derivative Assets, Net Fair Value Before Cash Collateral 168 641
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 168 641
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 451 812
Derivative Liabilities, Netting Adjustments (302) (201)
Derivative Liabilities, Net Fair Value Before Cash Collateral 149 611
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 149 611
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 209,515 184,990
Derivative Liabilities, Notional 200,347 177,423
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 206,914 183,759
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 206,914 183,759
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 206,914 183,759
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 197,807 175,922
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 197,807 175,922
Derivative Liabilities, Cash Collateral (433) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 197,374 175,922
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 82,860 89,085
Derivative Liabilities, Notional 82,860 89,085
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 3,114 2,021
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 3,114 2,021
Derivative Assets, Cash Collateral (660) (648)
Derviative contracts, net of cash collateral, Assets, Fair value 2,454 1,373
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 3,114 2,021
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 3,114 2,021
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 3,114 2,021
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 73,658,685 15,356,909
Derivative Liabilities, Notional 75,247,769 19,374,294
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 205,188 45,346
Derivative Assets, Netting Adjustments (193,306) (39,521)
Derivative Assets, Net Fair Value Before Cash Collateral 11,882 5,825
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 11,882 5,825
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 207,542 56,983
Derivative Liabilities, Netting Adjustments (193,306) (39,521)
Derivative Liabilities, Net Fair Value Before Cash Collateral 14,236 17,462
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 14,236 17,462
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 433,804 553,079
Derivative Liabilities, Notional 483,370 260,348
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 9,037 5,064
Derivative Assets, Netting Adjustments (2,992) (1,350)
Derivative Assets, Net Fair Value Before Cash Collateral 6,045 3,714
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 6,045 3,714
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 5,435 9,439
Derivative Liabilities, Netting Adjustments (2,992) (1,350)
Derivative Liabilities, Net Fair Value Before Cash Collateral 2,443 8,089
Derivative Liabilities, Cash Collateral (1,708) (7,315)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 735 $ 774
[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.