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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 415,221 $ 320,929
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 381,454 362,306
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 58,739,542 [1] 30,272,764 [2]
Derivative Liabilities, Notional 60,319,330 [1] 33,838,893 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 823,555 571,793
Derivative Assets, Netting Adjustments (374,061) (135,530)
Derivative Assets, Net Fair Value Before Cash Collateral 449,494 436,263
Derivative Assets, Cash Collateral (34,273) (115,334)
Derviative contracts, net of cash collateral, Assets, Fair value 415,221 320,929
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 809,809 574,347
Derivative Liabilities, Netting Adjustments (374,061) (135,530)
Derivative Liabilities, Net Fair Value Before Cash Collateral 435,748 438,817
Derivative Liabilities, Cash Collateral (54,294) (76,511)
Derivative Liabilities, Fair Value, Net of Cash Collateral 381,454 362,306
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 5,762,313 [1] 14,362,776 [2]
Derivative Liabilities, Notional 5,690,371 [1] 14,204,251 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 470,747 521,383
Derivative Assets, Netting Adjustments (82,185) (94,659)
Derivative Assets, Net Fair Value Before Cash Collateral 388,562 426,724
Derivative Assets, Cash Collateral (34,273) (115,334)
Derviative contracts, net of cash collateral, Assets, Fair value 354,289 311,390
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 450,744 507,925
Derivative Liabilities, Netting Adjustments (82,185) (94,659)
Derivative Liabilities, Net Fair Value Before Cash Collateral 368,559 413,266
Derivative Liabilities, Cash Collateral (54,294) (69,196)
Derivative Liabilities, Fair Value, Net of Cash Collateral 314,265 344,070
Not Designated as Hedging Instrument [Member] | To-be-announced residential mortgage-backed securities [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 1,303,659 10,671,151
Derivative Liabilities, Notional 1,298,129 10,558,151
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 11,707 92,231
Derivative Assets, Netting Adjustments (3,352) (26,787)
Derivative Assets, Net Fair Value Before Cash Collateral 8,355 65,444
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 8,355 65,444
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 11,596 90,388
Derivative Liabilities, Netting Adjustments (3,352) (26,787)
Derivative Liabilities, Net Fair Value Before Cash Collateral 8,244 63,601
Derivative Liabilities, Cash Collateral (8,232) (63,596)
Derivative Liabilities, Fair Value, Net of Cash Collateral 12 5
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 2,254,122 1,924,131
Derivative Liabilities, Notional 2,254,122 1,924,131
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 51,177 36,112
Derivative Assets, Netting Adjustments (2,168) (6,688)
Derivative Assets, Net Fair Value Before Cash Collateral 49,009 29,424
Derivative Assets, Cash Collateral (42) (7,934)
Derviative contracts, net of cash collateral, Assets, Fair value 48,967 21,490
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 51,271 36,288
Derivative Liabilities, Netting Adjustments (2,168) (6,688)
Derivative Liabilities, Net Fair Value Before Cash Collateral 49,103 29,600
Derivative Liabilities, Cash Collateral (43,288) (4,110)
Derivative Liabilities, Fair Value, Net of Cash Collateral 5,815 25,490
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 1,849,474 1,472,209
Derivative Liabilities, Notional 1,794,912 1,434,247
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 153,514 206,418
Derivative Assets, Netting Adjustments (76,562) (60,983)
Derivative Assets, Net Fair Value Before Cash Collateral 76,952 145,435
Derivative Assets, Cash Collateral (33,847) (106,752)
Derviative contracts, net of cash collateral, Assets, Fair value 43,105 38,683
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 145,442 202,494
Derivative Liabilities, Netting Adjustments (76,562) (60,983)
Derivative Liabilities, Net Fair Value Before Cash Collateral 68,880 141,511
Derivative Liabilities, Cash Collateral (1,836) (1,490)
Derivative Liabilities, Fair Value, Net of Cash Collateral 67,044 140,021
Not Designated as Hedging Instrument [Member] | Agricultural contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 16,662 21,210
Derivative Liabilities, Notional 16,678 21,214
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 788 842
Derivative Assets, Netting Adjustments (103) (201)
Derivative Assets, Net Fair Value Before Cash Collateral 685 641
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 685 641
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 776 812
Derivative Liabilities, Netting Adjustments (103) (201)
Derivative Liabilities, Net Fair Value Before Cash Collateral 673 611
Derivative Liabilities, Cash Collateral (629) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 44 611
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 252,272 184,990
Derivative Liabilities, Notional 240,406 177,423
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 250,527 183,759
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 250,527 183,759
Derivative Assets, Cash Collateral (384) 0
Derviative contracts, net of cash collateral, Assets, Fair value 250,143 183,759
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 238,625 175,922
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 238,625 175,922
Derivative Liabilities, Cash Collateral (309) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 238,316 175,922
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 86,124 89,085
Derivative Liabilities, Notional 86,124 89,085
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 3,034 2,021
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 3,034 2,021
Derivative Assets, Cash Collateral 0 (648)
Derviative contracts, net of cash collateral, Assets, Fair value 3,034 1,373
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 3,034 2,021
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 3,034 2,021
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 3,034 2,021
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 52,977,229 15,909,988
Derivative Liabilities, Notional 54,628,959 19,634,642
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 352,808 50,410
Derivative Assets, Netting Adjustments (291,876) (40,871)
Derivative Assets, Net Fair Value Before Cash Collateral 60,932 9,539
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 60,932 9,539
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 359,065 66,422
Derivative Liabilities, Netting Adjustments (291,876) (40,871)
Derivative Liabilities, Net Fair Value Before Cash Collateral 67,189 25,551
Derivative Liabilities, Cash Collateral 0 (7,315)
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 67,189 $ 18,236
[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.