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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 1,901,136 $ 810,688
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 739,641 405,779
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 75,864,991 [1] 93,418,715 [2]
Derivative Liabilities, Notional 72,241,925 [1] 96,326,522 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 2,711,717 1,294,849
Derivative Assets, Netting Adjustments (808,523) (456,498)
Derivative Assets, Net Fair Value Before Cash Collateral 1,903,194 838,351
Derivative Assets, Cash Collateral (2,058) (27,663)
Derviative contracts, net of cash collateral, Assets, Fair value 1,901,136 810,688
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 2,725,232 1,231,665
Derivative Liabilities, Netting Adjustments (808,523) (456,498)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,916,709 775,167
Derivative Liabilities, Cash Collateral (1,177,068) (369,388)
Derivative Liabilities, Fair Value, Net of Cash Collateral 739,641 405,779
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 9,262,207 [1] 7,425,999 [2]
Derivative Liabilities, Notional 9,146,887 [1] 7,251,350 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 2,114,510 836,870
Derivative Assets, Netting Adjustments (419,147) (211,612)
Derivative Assets, Net Fair Value Before Cash Collateral 1,695,363 625,258
Derivative Assets, Cash Collateral (932) (705)
Derviative contracts, net of cash collateral, Assets, Fair value 1,694,431 624,553
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 2,147,730 811,335
Derivative Liabilities, Netting Adjustments (419,147) (211,612)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,728,583 599,723
Derivative Liabilities, Cash Collateral (1,152,614) (223,281)
Derivative Liabilities, Fair Value, Net of Cash Collateral 575,969 376,442
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,010,596 [1] 3,212,469 [2]
Derivative Liabilities, Notional 3,010,596 [1] 3,212,469 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 70,372 113,524
Derivative Assets, Netting Adjustments (6,971) (144)
Derivative Assets, Net Fair Value Before Cash Collateral 63,401 113,380
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 63,401 113,380
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 70,612 113,900
Derivative Liabilities, Netting Adjustments (6,971) (144)
Derivative Liabilities, Net Fair Value Before Cash Collateral 63,641 113,756
Derivative Liabilities, Cash Collateral (56,405) (104,202)
Derivative Liabilities, Fair Value, Net of Cash Collateral 7,236 9,554
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 5,901,682 [1] 3,791,565 [2]
Derivative Liabilities, Notional 5,787,366 [1] 3,617,678 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,743,938 386,008
Derivative Assets, Netting Adjustments (412,176) (211,468)
Derivative Assets, Net Fair Value Before Cash Collateral 1,331,762 174,540
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 1,331,762 174,540
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,778,045 361,334
Derivative Liabilities, Netting Adjustments (412,176) (211,468)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,365,869 149,866
Derivative Liabilities, Cash Collateral (1,096,209) (114,070)
Derivative Liabilities, Fair Value, Net of Cash Collateral 269,660 35,796
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 0 [1] 14,765 [2]
Derivative Liabilities, Notional 0 [1] 14,781 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 0 3,859
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 0 3,859
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 0 3,859
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 0 3,844
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 0 3,844
Derivative Liabilities, Cash Collateral 0 (3,844)
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 301,216 [1] 337,001 [2]
Derivative Liabilities, Notional 300,212 [1] 336,223 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 299,335 332,257
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 299,335 332,257
Derivative Assets, Cash Collateral (666) (420)
Derviative contracts, net of cash collateral, Assets, Fair value 298,669 331,837
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 298,208 331,035
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 298,208 331,035
Derivative Liabilities, Cash Collateral 0 (1,165)
Derivative Liabilities, Fair Value, Net of Cash Collateral 298,208 329,870
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 48,713 [1] 70,199 [2]
Derivative Liabilities, Notional 48,713 [1] 70,199 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 865 1,222
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 865 1,222
Derivative Assets, Cash Collateral (266) (285)
Derviative contracts, net of cash collateral, Assets, Fair value 599 937
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 865 1,222
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 865 1,222
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 865 1,222
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 66,331,907 [1] 84,997,593 [2]
Derivative Liabilities, Notional 61,791,246 [1] 88,929,916 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 589,601 440,627
Derivative Assets, Netting Adjustments (383,764) (240,655)
Derivative Assets, Net Fair Value Before Cash Collateral 205,837 199,972
Derivative Assets, Cash Collateral (1,126) (26,958)
Derviative contracts, net of cash collateral, Assets, Fair value 204,711 173,014
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 562,083 414,801
Derivative Liabilities, Netting Adjustments (383,764) (240,655)
Derivative Liabilities, Net Fair Value Before Cash Collateral 178,319 174,146
Derivative Liabilities, Cash Collateral (16,046) (145,692)
Derivative Liabilities, Fair Value, Net of Cash Collateral 162,273 28,454
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 270,877 [1] 995,123 [2]
Derivative Liabilities, Notional 1,303,792 [1] 145,256 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 7,606 17,352
Derivative Assets, Netting Adjustments (5,612) (4,231)
Derivative Assets, Net Fair Value Before Cash Collateral 1,994 13,121
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 1,994 13,121
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 15,419 5,529
Derivative Liabilities, Netting Adjustments (5,612) (4,231)
Derivative Liabilities, Net Fair Value Before Cash Collateral 9,807 1,298
Derivative Liabilities, Cash Collateral (8,408) (415)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 1,399 $ 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.