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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 1,289,156 $ 810,688
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 719,556 405,779
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 76,195,298 [1] 93,418,715 [2]
Derivative Liabilities, Notional 75,375,971 [1] 96,326,522 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,847,005 1,294,849
Derivative Assets, Netting Adjustments (556,235) (456,498)
Derivative Assets, Net Fair Value Before Cash Collateral 1,290,770 838,351
Derivative Assets, Cash Collateral (1,614) (27,663)
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,884,011 1,231,665
Derivative Liabilities, Netting Adjustments (556,235) (456,498)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,327,776 775,167
Derivative Liabilities, Cash Collateral (608,220) (369,388)
Derivative Liabilities, Fair Value, Net of Cash Collateral 719,556 405,779
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 7,597,406 [1] 7,425,999 [2]
Derivative Liabilities, Notional 7,564,738 [1] 7,251,350 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,043,939 836,870
Derivative Assets, Netting Adjustments (163,485) (211,612)
Derivative Assets, Net Fair Value Before Cash Collateral 880,454 625,258
Derivative Assets, Cash Collateral (840) (705)
Derviative contracts, net of cash collateral, Assets, Fair value 879,614 624,553
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,028,545 811,335
Derivative Liabilities, Netting Adjustments (163,485) (211,612)
Derivative Liabilities, Net Fair Value Before Cash Collateral 865,060 599,723
Derivative Liabilities, Cash Collateral (504,386) (223,281)
Derivative Liabilities, Fair Value, Net of Cash Collateral 360,674 376,442
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,221,571 [1] 3,212,469 [2]
Derivative Liabilities, Notional 3,221,571 [1] 3,212,469 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 79,353 113,524
Derivative Assets, Netting Adjustments (9,135) (144)
Derivative Assets, Net Fair Value Before Cash Collateral 70,218 113,380
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 70,218 113,380
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 79,619 113,900
Derivative Liabilities, Netting Adjustments (9,135) (144)
Derivative Liabilities, Net Fair Value Before Cash Collateral 70,484 113,756
Derivative Liabilities, Cash Collateral (60,429) (104,202)
Derivative Liabilities, Fair Value, Net of Cash Collateral 10,055 9,554
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,930,367 [1] 3,791,565 [2]
Derivative Liabilities, Notional 3,897,430 [1] 3,617,678 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 618,401 386,008
Derivative Assets, Netting Adjustments (152,837) (211,468)
Derivative Assets, Net Fair Value Before Cash Collateral 465,564 174,540
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 465,564 174,540
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 602,728 361,334
Derivative Liabilities, Netting Adjustments (152,837) (211,468)
Derivative Liabilities, Net Fair Value Before Cash Collateral 449,891 149,866
Derivative Liabilities, Cash Collateral (443,933) (114,070)
Derivative Liabilities, Fair Value, Net of Cash Collateral 5,958 35,796
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 32,893 [1] 14,765 [2]
Derivative Liabilities, Notional 32,893 [1] 14,781 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,629 3,859
Derivative Assets, Netting Adjustments (1,513) 0
Derivative Assets, Net Fair Value Before Cash Collateral 116 3,859
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 116 3,859
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,609 3,844
Derivative Liabilities, Netting Adjustments (1,513) 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 96 3,844
Derivative Liabilities, Cash Collateral 0 (3,844)
Derivative Liabilities, Fair Value, Net of Cash Collateral 96 0
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 346,897 [1] 337,001 [2]
Derivative Liabilities, Notional 347,166 [1] 336,223 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 343,101 332,257
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 343,101 332,257
Derivative Assets, Cash Collateral (540) (420)
Derviative contracts, net of cash collateral, Assets, Fair value 342,561 331,837
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 343,134 331,035
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 343,134 331,035
Derivative Liabilities, Cash Collateral (24) (1,165)
Derivative Liabilities, Fair Value, Net of Cash Collateral 343,110 329,870
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 65,678 [1] 70,199 [2]
Derivative Liabilities, Notional 65,678 [1] 70,199 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,455 1,222
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 1,455 1,222
Derivative Assets, Cash Collateral (300) (285)
Derviative contracts, net of cash collateral, Assets, Fair value 1,155 937
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,455 1,222
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,455 1,222
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 1,455 1,222
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 67,796,867 [1] 84,997,593 [2]
Derivative Liabilities, Notional 66,746,760 [1] 88,929,916 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 785,765 440,627
Derivative Assets, Netting Adjustments (380,313) (240,655)
Derivative Assets, Net Fair Value Before Cash Collateral 405,452 199,972
Derivative Assets, Cash Collateral (774) (26,958)
Derviative contracts, net of cash collateral, Assets, Fair value 404,678 173,014
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 834,430 414,801
Derivative Liabilities, Netting Adjustments (380,313) (240,655)
Derivative Liabilities, Net Fair Value Before Cash Collateral 454,117 174,146
Derivative Liabilities, Cash Collateral (99,371) (145,692)
Derivative Liabilities, Fair Value, Net of Cash Collateral 354,746 28,454
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 801,025 [1] 995,123 [2]
Derivative Liabilities, Notional 1,064,473 [1] 145,256 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 17,301 17,352
Derivative Assets, Netting Adjustments (12,437) (4,231)
Derivative Assets, Net Fair Value Before Cash Collateral 4,864 13,121
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 4,864 13,121
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 21,036 5,529
Derivative Liabilities, Netting Adjustments (12,437) (4,231)
Derivative Liabilities, Net Fair Value Before Cash Collateral 8,599 1,298
Derivative Liabilities, Cash Collateral (4,463) (415)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 4,136 $ 883
[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.