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Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Derivative Assets, Fair Value, Net [Abstract]    
Derviative contracts, net of cash collateral, Assets, Fair value $ 299,215 $ 242,809
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Fair Value, Net of Cash Collateral 306,796 237,582
Not Designated as Hedging Instrument [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 31,457,630 [1] 29,893,977 [2]
Derivative Liabilities, Notional 31,167,965 [1] 25,018,428 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 737,844 779,821
Derivative Assets, Netting Adjustments (393,549) (460,985)
Derivative Assets, Net Fair Value Before Cash Collateral 344,295 318,836
Derivative Assets, Cash Collateral (45,080) (76,027)
Derviative contracts, net of cash collateral, Assets, Fair value 299,215 242,809
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 720,200 701,259
Derivative Liabilities, Netting Adjustments (393,549) (460,985)
Derivative Liabilities, Net Fair Value Before Cash Collateral 326,651 240,274
Derivative Liabilities, Cash Collateral (19,855) (2,692)
Derivative Liabilities, Fair Value, Net of Cash Collateral 306,796 237,582
Not Designated as Hedging Instrument [Member] | Total customer risk management programs    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 9,226,985 [1] 10,316,447 [2]
Derivative Liabilities, Notional 9,196,040 [1] 10,219,846 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 662,551 646,223
Derivative Assets, Netting Adjustments (345,773) (404,221)
Derivative Assets, Net Fair Value Before Cash Collateral 316,778 242,002
Derivative Assets, Cash Collateral (40,178) (75,785)
Derviative contracts, net of cash collateral, Assets, Fair value 276,600 166,217
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 639,515 609,715
Derivative Liabilities, Netting Adjustments (345,773) (404,221)
Derivative Liabilities, Net Fair Value Before Cash Collateral 293,742 205,494
Derivative Liabilities, Cash Collateral (4,300) (1,400)
Derivative Liabilities, Fair Value, Net of Cash Collateral 289,442 204,094
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 2,791,627 [1] 3,064,418 [2]
Derivative Liabilities, Notional 2,761,850 [1] 3,064,418 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 55,557 82,191
Derivative Assets, Netting Adjustments (18,378) (5,369)
Derivative Assets, Net Fair Value Before Cash Collateral 37,179 76,822
Derivative Assets, Cash Collateral (18,966) (71,485)
Derviative contracts, net of cash collateral, Assets, Fair value 18,213 5,337
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 55,722 82,141
Derivative Liabilities, Netting Adjustments (18,378) (5,369)
Derivative Liabilities, Net Fair Value Before Cash Collateral 37,344 76,772
Derivative Liabilities, Cash Collateral (270) 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 37,074 76,772
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 6,351,889 [1] 7,169,926 [2]
Derivative Liabilities, Notional 6,350,981 [1] 7,076,929 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 545,474 521,032
Derivative Assets, Netting Adjustments (327,340) (398,457)
Derivative Assets, Net Fair Value Before Cash Collateral 218,134 122,575
Derivative Assets, Cash Collateral (20,384) (3,816)
Derviative contracts, net of cash collateral, Assets, Fair value 197,750 118,759
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 522,548 488,113
Derivative Liabilities, Netting Adjustments (327,340) (398,457)
Derivative Liabilities, Net Fair Value Before Cash Collateral 195,208 89,656
Derivative Liabilities, Cash Collateral (4,030) (1,020)
Derivative Liabilities, Fair Value, Net of Cash Collateral 191,178 88,636
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 81,876 [1] 80,510 [2]
Derivative Liabilities, Notional 81,616 [1] 76,906 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 61,286 42,792
Derivative Assets, Netting Adjustments (55) (395)
Derivative Assets, Net Fair Value Before Cash Collateral 61,231 42,397
Derivative Assets, Cash Collateral (778) (434)
Derviative contracts, net of cash collateral, Assets, Fair value 60,453 41,963
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 61,011 39,253
Derivative Liabilities, Netting Adjustments (55) (395)
Derivative Liabilities, Net Fair Value Before Cash Collateral 60,956 38,858
Derivative Liabilities, Cash Collateral 0 (380)
Derivative Liabilities, Fair Value, Net of Cash Collateral 60,956 38,478
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 1,593 [1] 1,593 [2]
Derivative Liabilities, Notional 1,593 [1] 1,593 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 234 208
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 234 208
Derivative Assets, Cash Collateral (50) (50)
Derviative contracts, net of cash collateral, Assets, Fair value 184 158
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 234 208
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 234 208
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral 234 208
Not Designated as Hedging Instrument [Member] | Trading [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 22,147,710 [1] 19,577,362 [2]
Derivative Liabilities, Notional 21,300,664 [1] 14,196,406 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 74,304 132,581
Derivative Assets, Netting Adjustments (47,776) (56,764)
Derivative Assets, Net Fair Value Before Cash Collateral 26,528 75,817
Derivative Assets, Cash Collateral (4,902) (242)
Derviative contracts, net of cash collateral, Assets, Fair value 21,626 75,575
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 74,160 87,082
Derivative Liabilities, Netting Adjustments (47,776) (56,764)
Derivative Liabilities, Net Fair Value Before Cash Collateral 26,384 30,318
Derivative Liabilities, Cash Collateral (15,555) (1,292)
Derivative Liabilities, Fair Value, Net of Cash Collateral 10,829 29,026
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]    
Notional Amount of Derivatives [Abstract]    
Derivative Assets, Notional 82,935 [1] 168 [2]
Derivative Liabilities, Notional 671,261 [1] 602,176 [2]
Derivative Assets, Fair Value, Net [Abstract]    
Derivative Assets, Gross Fair Value 989 1,017
Derivative Assets, Netting Adjustments 0 0
Derivative Assets, Net Fair Value Before Cash Collateral 989 1,017
Derivative Assets, Cash Collateral 0 0
Derviative contracts, net of cash collateral, Assets, Fair value 989 1,017
Derivative Liabilities, Fair Value, Net [Abstract]    
Derivative Liabilities, Gross Fair Value 6,525 4,462
Derivative Liabilities, Netting Adjustments 0 0
Derivative Liabilities, Net Fair Value Before Cash Collateral 6,525 4,462
Derivative Liabilities, Cash Collateral 0 0
Derivative Liabilities, Fair Value, Net of Cash Collateral $ 6,525 $ 4,462
[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.