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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Fair Value, Net of Cash Collateral $ 810,688 $ 323,375
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 405,779 251,128
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 93,418,715 [1] 75,917,378 [2]
Derivative Liabilities, Notional 96,326,522 [1] 70,400,171 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,294,849 549,555
Derivative Assets, Netting Adjustments (456,498) (225,482)
Derivative Assets, Net Fair Value Before Cash Collateral 838,351 324,073
Derivative Assets, Cash Collateral (27,663) (698)
Derivative Assets, Fair Value, Net of Cash Collateral 810,688 323,375
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,231,665 528,921
Derivative Liabilities, Netting Adjustments (456,498) (225,482)
Derivative Liabilities, Net Fair Value Before Cash Collateral 775,167 303,439
Derivative Liabilities, Cash Collateral (369,388) (52,311)
Derivative Liabilities, Fair Value, Net of Cash Collateral 405,779 251,128
Not Designated as Hedging Instrument [Member] | Total customer risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 7,425,999 [1] 4,927,266 [2]
Derivative Liabilities, Notional 7,251,350 [1] 4,875,382 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 836,870 411,768
Derivative Assets, Netting Adjustments (211,612) (109,452)
Derivative Assets, Net Fair Value Before Cash Collateral 625,258 302,316
Derivative Assets, Cash Collateral (705) (698)
Derivative Assets, Fair Value, Net of Cash Collateral 624,553 301,618
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 811,335 400,265
Derivative Liabilities, Netting Adjustments (211,612) (109,452)
Derivative Liabilities, Net Fair Value Before Cash Collateral 599,723 290,813
Derivative Liabilities, Cash Collateral (223,281) (51,448)
Derivative Liabilities, Fair Value, Net of Cash Collateral 376,442 239,365
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,212,469 [1] 2,464,478 [2]
Derivative Liabilities, Notional 3,212,469 [1] 2,464,478 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 113,524 49,100
Derivative Assets, Netting Adjustments (144) (1,839)
Derivative Assets, Net Fair Value Before Cash Collateral 113,380 47,261
Derivative Assets, Cash Collateral 0 0
Derivative Assets, Fair Value, Net of Cash Collateral 113,380 47,261
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 113,900 49,194
Derivative Liabilities, Netting Adjustments (144) (1,839)
Derivative Liabilities, Net Fair Value Before Cash Collateral 113,756 47,355
Derivative Liabilities, Cash Collateral (104,202) (43,932)
Derivative Liabilities, Fair Value, Net of Cash Collateral 9,554 3,423
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,791,565 [1] 2,151,096 [2]
Derivative Liabilities, Notional 3,617,678 [1] 2,105,391 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 386,008 144,906
Derivative Assets, Netting Adjustments (211,468) (107,591)
Derivative Assets, Net Fair Value Before Cash Collateral 174,540 37,315
Derivative Assets, Cash Collateral 0 (38)
Derivative Assets, Fair Value, Net of Cash Collateral 174,540 37,277
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 361,334 139,311
Derivative Liabilities, Netting Adjustments (211,468) (107,591)
Derivative Liabilities, Net Fair Value Before Cash Collateral 149,866 31,720
Derivative Liabilities, Cash Collateral (114,070) (6,031)
Derivative Liabilities, Fair Value, Net of Cash Collateral 35,796 25,689
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 14,765 [1] 16,118 [2]
Derivative Liabilities, Notional 14,781 [1] 16,139 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 3,859 1,522
Derivative Assets, Netting Adjustments 0 (22)
Derivative Assets, Net Fair Value Before Cash Collateral 3,859 1,500
Derivative Assets, Cash Collateral 0 0
Derivative Assets, Fair Value, Net of Cash Collateral 3,859 1,500
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 3,844 1,507
Derivative Liabilities, Netting Adjustments 0 (22)
Derivative Liabilities, Net Fair Value Before Cash Collateral 3,844 1,485
Derivative Liabilities, Cash Collateral (3,844) (1,485)
Derivative Liabilities, Fair Value, Net of Cash Collateral 0 0
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 337,001 [1] 214,119 [2]
Derivative Liabilities, Notional 336,223 [1] 207,919 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 332,257 213,007
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 332,257 213,007
Derivative Assets, Cash Collateral (420) 0
Derivative Assets, Fair Value, Net of Cash Collateral 331,837 213,007
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 331,035 207,020
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 331,035 207,020
Derivative Liabilities, Cash Collateral (1,165) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 329,870 207,020
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 70,199 [1] 81,455 [2]
Derivative Liabilities, Notional 70,199 [1] 81,455 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,222 3,233
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 1,222 3,233
Derivative Assets, Cash Collateral (285) (660)
Derivative Assets, Fair Value, Net of Cash Collateral 937 2,573
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,222 3,233
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,222 3,233
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 1,222 3,233
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 84,997,593 [1] 69,721,932 [2]
Derivative Liabilities, Notional 88,929,916 [1] 65,144,388 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 440,627 131,561
Derivative Assets, Netting Adjustments (240,655) (115,949)
Derivative Assets, Net Fair Value Before Cash Collateral 199,972 15,612
Derivative Assets, Cash Collateral (26,958) 0
Derivative Assets, Fair Value, Net of Cash Collateral 173,014 15,612
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 414,801 125,535
Derivative Liabilities, Netting Adjustments (240,655) (115,949)
Derivative Liabilities, Net Fair Value Before Cash Collateral 174,146 9,586
Derivative Liabilities, Cash Collateral (145,692) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 28,454 9,586
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 995,123 [1] 1,268,180 [2]
Derivative Liabilities, Notional 145,256 [1] 380,401 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 17,352 6,226
Derivative Assets, Netting Adjustments (4,231) (81)
Derivative Assets, Net Fair Value Before Cash Collateral 13,121 6,145
Derivative Assets, Cash Collateral 0 0
Derivative Assets, Fair Value, Net of Cash Collateral 13,121 6,145
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 5,529 3,121
Derivative Liabilities, Netting Adjustments (4,231) (81)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,298 3,040
Derivative Liabilities, Cash Collateral (415) (863)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 883 $ 2,177
[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.