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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 922,716 $ 323,375
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 1,213,445 251,128
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 57,544,919 [1] 75,917,378 [2]
Derivative Liabilities, Notional 60,795,347 [1] 70,400,171 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,827,585 549,555
Derivative Assets, Netting Adjustments (473,276) (225,482)
Derivative Assets, Net Fair Value Before Cash Collateral 1,354,309 324,073
Derivative Assets, Cash Collateral (431,593) (698)
Derviative contracts, net of cash collateral, Assets, Fair value 922,716 323,375
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,814,616 528,921
Derivative Liabilities, Netting Adjustments (473,276) (225,482)
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,341,340 303,439
Derivative Liabilities, Cash Collateral (127,895) (52,311)
Derivative Liabilities, Fair Value, Net of Cash Collateral 1,213,445 251,128
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 5,141,394 [1] 4,927,266 [2]
Derivative Liabilities, Notional 5,088,012 [1] 4,875,382 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,030,117 411,768
Derivative Assets, Netting Adjustments (101,497) (109,452)
Derivative Assets, Net Fair Value Before Cash Collateral 928,620 302,316
Derivative Assets, Cash Collateral (414,260) (698)
Derviative contracts, net of cash collateral, Assets, Fair value 514,360 301,618
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 994,327 400,265
Derivative Liabilities, Netting Adjustments (101,497) (109,452)
Derivative Liabilities, Net Fair Value Before Cash Collateral 892,830 290,813
Derivative Liabilities, Cash Collateral (122,858) (51,448)
Derivative Liabilities, Fair Value, Net of Cash Collateral 769,972 239,365
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 2,632,062 2,464,478
Derivative Liabilities, Notional 2,632,062 2,464,478
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 132,346 49,100
Derivative Assets, Netting Adjustments (34) (1,839)
Derivative Assets, Net Fair Value Before Cash Collateral 132,312 47,261
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 132,312 47,261
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 132,622 49,194
Derivative Liabilities, Netting Adjustments (34) (1,839)
Derivative Liabilities, Net Fair Value Before Cash Collateral 132,588 47,355
Derivative Liabilities, Cash Collateral (122,237) (43,932)
Derivative Liabilities, Fair Value, Net of Cash Collateral 10,351 3,423
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 2,097,638 2,151,096
Derivative Liabilities, Notional 2,068,380 2,105,391
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 583,117 144,906
Derivative Assets, Netting Adjustments (100,748) (107,591)
Derivative Assets, Net Fair Value Before Cash Collateral 482,369 37,315
Derivative Assets, Cash Collateral (413,946) (38)
Derviative contracts, net of cash collateral, Assets, Fair value 68,423 37,277
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 571,306 139,311
Derivative Liabilities, Netting Adjustments (100,748) (107,591)
Derivative Liabilities, Net Fair Value Before Cash Collateral 470,558 31,720
Derivative Liabilities, Cash Collateral 0 (6,031)
Derivative Liabilities, Fair Value, Net of Cash Collateral 470,558 25,689
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 16,653 16,118
Derivative Liabilities, Notional 16,657 16,139
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 807 1,522
Derivative Assets, Netting Adjustments (715) (22)
Derivative Assets, Net Fair Value Before Cash Collateral 92 1,500
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 92 1,500
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 791 1,507
Derivative Liabilities, Netting Adjustments (715) (22)
Derivative Liabilities, Net Fair Value Before Cash Collateral 76 1,485
Derivative Liabilities, Cash Collateral 0 (1,485)
Derivative Liabilities, Fair Value, Net of Cash Collateral 76 0
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 317,068 214,119
Derivative Liabilities, Notional 292,940 207,919
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 312,685 213,007
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 312,685 213,007
Derivative Assets, Cash Collateral (25) 0
Derviative contracts, net of cash collateral, Assets, Fair value 312,660 213,007
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 288,446 207,020
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 288,446 207,020
Derivative Liabilities, Cash Collateral (621) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 287,825 207,020
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 77,973 81,455
Derivative Liabilities, Notional 77,973 81,455
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 1,162 3,233
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 1,162 3,233
Derivative Assets, Cash Collateral (289) (660)
Derviative contracts, net of cash collateral, Assets, Fair value 873 2,573
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 1,162 3,233
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 1,162 3,233
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 1,162 3,233
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 51,637,953 69,721,932
Derivative Liabilities, Notional 54,719,502 65,144,388
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 774,631 131,561
Derivative Assets, Netting Adjustments (371,512) (115,949)
Derivative Assets, Net Fair Value Before Cash Collateral 403,119 15,612
Derivative Assets, Cash Collateral (17,333) 0
Derviative contracts, net of cash collateral, Assets, Fair value 385,786 15,612
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 804,059 125,535
Derivative Liabilities, Netting Adjustments (371,512) (115,949)
Derivative Liabilities, Net Fair Value Before Cash Collateral 432,547 9,586
Derivative Liabilities, Cash Collateral (5,037) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 427,510 9,586
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 765,572 1,268,180
Derivative Liabilities, Notional 987,833 380,401
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 22,837 6,226
Derivative Assets, Netting Adjustments (267) (81)
Derivative Assets, Net Fair Value Before Cash Collateral 22,570 6,145
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 22,570 6,145
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 16,230 3,121
Derivative Liabilities, Netting Adjustments (267) (81)
Derivative Liabilities, Net Fair Value Before Cash Collateral 15,963 3,040
Derivative Liabilities, Cash Collateral 0 (863)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 15,963 $ 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.