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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 593,568 $ 323,375
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 446,328 251,128
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 73,085,428 [1] 75,917,378 [2]
Derivative Liabilities, Notional 72,386,971 [1] 70,400,171 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,099,436 549,555
Derivative Assets, Netting Adjustments (409,255) (225,482)
Derivative Assets, Net Fair Value Before Cash Collateral 690,181 324,073
Derivative Assets, Cash Collateral (96,613) (698)
Derviative contracts, net of cash collateral, Assets, Fair value 593,568 323,375
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,055,185 528,921
Derivative Liabilities, Netting Adjustments (409,255) (225,482)
Derivative Liabilities, Net Fair Value Before Cash Collateral 645,930 303,439
Derivative Liabilities, Cash Collateral (199,602) (52,311)
Derivative Liabilities, Fair Value, Net of Cash Collateral 446,328 251,128
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 7,060,324 [1] 4,927,266 [2]
Derivative Liabilities, Notional 6,855,256 [1] 4,875,382 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 844,903 411,768
Derivative Assets, Netting Adjustments (229,540) (109,452)
Derivative Assets, Net Fair Value Before Cash Collateral 615,363 302,316
Derivative Assets, Cash Collateral (92,789) (698)
Derviative contracts, net of cash collateral, Assets, Fair value 522,574 301,618
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 818,517 400,265
Derivative Liabilities, Netting Adjustments (229,540) (109,452)
Derivative Liabilities, Net Fair Value Before Cash Collateral 588,977 290,813
Derivative Liabilities, Cash Collateral (160,344) (51,448)
Derivative Liabilities, Fair Value, Net of Cash Collateral 428,633 239,365
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,179,414 [1] 2,464,478 [2]
Derivative Liabilities, Notional 3,179,414 [1] 2,464,478 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 132,320 49,100
Derivative Assets, Netting Adjustments (107) (1,839)
Derivative Assets, Net Fair Value Before Cash Collateral 132,213 47,261
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 132,213 47,261
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 132,689 49,194
Derivative Liabilities, Netting Adjustments (107) (1,839)
Derivative Liabilities, Net Fair Value Before Cash Collateral 132,582 47,355
Derivative Liabilities, Cash Collateral (121,212) (43,932)
Derivative Liabilities, Fair Value, Net of Cash Collateral 11,370 3,423
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 3,482,226 [1] 2,151,096 [2]
Derivative Liabilities, Notional 3,277,670 [1] 2,105,391 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 400,646 144,906
Derivative Assets, Netting Adjustments (229,433) (107,591)
Derivative Assets, Net Fair Value Before Cash Collateral 171,213 37,315
Derivative Assets, Cash Collateral (92,170) (38)
Derviative contracts, net of cash collateral, Assets, Fair value 79,043 37,277
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 374,542 139,311
Derivative Liabilities, Netting Adjustments (229,433) (107,591)
Derivative Liabilities, Net Fair Value Before Cash Collateral 145,109 31,720
Derivative Liabilities, Cash Collateral (37,276) (6,031)
Derivative Liabilities, Fair Value, Net of Cash Collateral 107,833 25,689
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 13,611 [1] 16,118 [2]
Derivative Liabilities, Notional 13,627 [1] 16,139 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,870 1,522
Derivative Assets, Netting Adjustments 0 (22)
Derivative Assets, Net Fair Value Before Cash Collateral 1,870 1,500
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 1,870 1,500
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,856 1,507
Derivative Liabilities, Netting Adjustments 0 (22)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,856 1,485
Derivative Liabilities, Cash Collateral (1,856) (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 311,626 [1] 214,119 [2]
Derivative Liabilities, Notional 311,098 [1] 207,919 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 309,130 213,007
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 309,130 213,007
Derivative Assets, Cash Collateral (400) 0
Derviative contracts, net of cash collateral, Assets, Fair value 308,730 213,007
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 308,493 207,020
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 308,493 207,020
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 308,493 207,020
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 73,447 [1] 81,455 [2]
Derivative Liabilities, Notional 73,447 [1] 81,455 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 937 3,233
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 937 3,233
Derivative Assets, Cash Collateral (219) (660)
Derviative contracts, net of cash collateral, Assets, Fair value 718 2,573
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 937 3,233
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 937 3,233
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 937 3,233
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 65,290,962 [1] 69,721,932 [2]
Derivative Liabilities, Notional 64,972,263 [1] 65,144,388 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 235,176 131,561
Derivative Assets, Netting Adjustments (173,680) (115,949)
Derivative Assets, Net Fair Value Before Cash Collateral 61,496 15,612
Derivative Assets, Cash Collateral (3,824) 0
Derviative contracts, net of cash collateral, Assets, Fair value 57,672 15,612
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 229,013 125,535
Derivative Liabilities, Netting Adjustments (173,680) (115,949)
Derivative Liabilities, Net Fair Value Before Cash Collateral 55,333 9,586
Derivative Liabilities, Cash Collateral (38,999) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 16,334 9,586
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 734,142 [1] 1,268,180 [2]
Derivative Liabilities, Notional 559,452 [1] 380,401 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 19,357 6,226
Derivative Assets, Netting Adjustments (6,035) (81)
Derivative Assets, Net Fair Value Before Cash Collateral 13,322 6,145
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 13,322 6,145
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 7,655 3,121
Derivative Liabilities, Netting Adjustments (6,035) (81)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,620 3,040
Derivative Liabilities, Cash Collateral (259) (863)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 1,361 $ 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.