Derivatives, Fair Value of Derivatives Contracts (Details) - USD ($) $ in Thousands		Mar. 31, 2024		Dec. 31, 2023
Derivative Assets, Fair Value, Net [Abstract]
Derviative contracts, net of cash collateral, Assets, Fair value		$ 263,493		$ 410,304
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Fair Value, Net of Cash Collateral		438,605		587,473
Not Designated as Hedging Instrument [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		30,472,769	[1]	27,348,813	[2]
Derivative Liabilities, Notional		34,633,455	[1]	31,712,601	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		999,850		1,125,034
Derivative Assets, Netting Adjustments		(506,617)		(443,069)
Derivative Assets, Net Fair Value Before Cash Collateral		493,233		681,965
Derivative Assets, Cash Collateral		(229,740)		(271,661)
Derviative contracts, net of cash collateral, Assets, Fair value		263,493		410,304
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		1,021,229		1,218,900
Derivative Liabilities, Netting Adjustments		(506,617)		(443,069)
Derivative Liabilities, Net Fair Value Before Cash Collateral		514,612		775,831
Derivative Liabilities, Cash Collateral		(76,007)		(188,358)
Derivative Liabilities, Fair Value, Net of Cash Collateral		438,605		587,473
Not Designated as Hedging Instrument [Member] | Total customer risk management programs
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		10,400,044	[1]	10,658,981	[2]
Derivative Liabilities, Notional		10,843,682	[1]	11,066,201	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		928,550		998,792
Derivative Assets, Netting Adjustments		(465,139)		(405,958)
Derivative Assets, Net Fair Value Before Cash Collateral		463,411		592,834
Derivative Assets, Cash Collateral		(229,696)		(264,665)
Derviative contracts, net of cash collateral, Assets, Fair value		233,715		328,169
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		925,163		992,988
Derivative Liabilities, Netting Adjustments		(465,139)		(405,958)
Derivative Liabilities, Net Fair Value Before Cash Collateral		460,024		587,030
Derivative Liabilities, Cash Collateral		(29,444)		(6,441)
Derivative Liabilities, Fair Value, Net of Cash Collateral		430,580		580,589
Not Designated as Hedging Instrument [Member] | Interest rate contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		3,075,103	[1]	2,754,476	[2]
Derivative Liabilities, Notional	[1]	3,065,103		2,754,476
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		118,237		108,450
Derivative Assets, Netting Adjustments		(3,844)		(6,810)
Derivative Assets, Net Fair Value Before Cash Collateral		114,393		101,640
Derivative Assets, Cash Collateral		(111,283)		(94,608)
Derviative contracts, net of cash collateral, Assets, Fair value		3,110		7,032
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		116,796		108,402
Derivative Liabilities, Netting Adjustments		(3,844)		(6,810)
Derivative Liabilities, Net Fair Value Before Cash Collateral		112,952		101,592
Derivative Liabilities, Cash Collateral		0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral		112,952		101,592
Not Designated as Hedging Instrument [Member] | Energy contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		7,266,492	[1]	7,846,190	[2]
Derivative Liabilities, Notional		7,720,466	[1]	8,254,004	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		754,565		836,425
Derivative Assets, Netting Adjustments		(461,295)		(399,148)
Derivative Assets, Net Fair Value Before Cash Collateral		293,270		437,277
Derivative Assets, Cash Collateral		(117,521)		(169,141)
Derviative contracts, net of cash collateral, Assets, Fair value		175,749		268,136
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		753,145		831,467
Derivative Liabilities, Netting Adjustments		(461,295)		(399,148)
Derivative Liabilities, Net Fair Value Before Cash Collateral		291,850		432,319
Derivative Liabilities, Cash Collateral		(29,444)		(6,441)
Derivative Liabilities, Fair Value, Net of Cash Collateral		262,406		425,878
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		56,590	[1]	54,999	[2]
Derivative Liabilities, Notional		56,254	[1]	54,405	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		55,687		53,863
Derivative Assets, Netting Adjustments		0		0
Derivative Assets, Net Fair Value Before Cash Collateral		55,687		53,863
Derivative Assets, Cash Collateral		(842)		(872)
Derviative contracts, net of cash collateral, Assets, Fair value		54,845		52,991
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		55,161		53,065
Derivative Liabilities, Netting Adjustments		0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral		55,161		53,065
Derivative Liabilities, Cash Collateral		0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral		55,161		53,065
Not Designated as Hedging Instrument [Member] | Equity option contracts [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		1,859	[1]	3,316	[2]
Derivative Liabilities, Notional		1,859	[1]	3,316	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		61		54
Derivative Assets, Netting Adjustments		0		0
Derivative Assets, Net Fair Value Before Cash Collateral		61		54
Derivative Assets, Cash Collateral		(50)		(44)
Derviative contracts, net of cash collateral, Assets, Fair value		11		10
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		61		54
Derivative Liabilities, Netting Adjustments		0		0
Derivative Liabilities, Net Fair Value Before Cash Collateral		61		54
Derivative Liabilities, Cash Collateral		0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral		61		54
Not Designated as Hedging Instrument [Member] | Trading [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		19,616,813	[1]	16,264,818	[2]
Derivative Liabilities, Notional		23,751,156	[1]	20,644,156	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		67,692		118,545
Derivative Assets, Netting Adjustments		(40,165)		(37,111)
Derivative Assets, Net Fair Value Before Cash Collateral		27,527		81,434
Derivative Assets, Cash Collateral		(44)		(6,996)
Derviative contracts, net of cash collateral, Assets, Fair value		27,483		74,438
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		93,502		224,648
Derivative Liabilities, Netting Adjustments		(40,165)		(37,111)
Derivative Liabilities, Net Fair Value Before Cash Collateral		53,337		187,537
Derivative Liabilities, Cash Collateral		(46,563)		(181,917)
Derivative Liabilities, Fair Value, Net of Cash Collateral		6,774		5,620
Not Designated as Hedging Instrument [Member] | Internal risk management programs [Member]
Notional Amount of Derivatives [Abstract]
Derivative Assets, Notional		455,912	[1]	425,014	[2]
Derivative Liabilities, Notional		38,617	[1]	2,244	[2]
Derivative Assets, Fair Value, Net [Abstract]
Derivative Assets, Gross Fair Value		3,608		7,697
Derivative Assets, Netting Adjustments		(1,313)		0
Derivative Assets, Net Fair Value Before Cash Collateral		2,295		7,697
Derivative Assets, Cash Collateral		0		0
Derviative contracts, net of cash collateral, Assets, Fair value		2,295		7,697
Derivative Liabilities, Fair Value, Net [Abstract]
Derivative Liabilities, Gross Fair Value		2,564		1,264
Derivative Liabilities, Netting Adjustments		(1,313)		0
Derivative Liabilities, Net Fair Value Before Cash Collateral		1,251		1,264
Derivative Liabilities, Cash Collateral		0		0
Derivative Liabilities, Fair Value, Net of Cash Collateral		$ 1,251		$ 1,264

[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.