Derivatives - Schedule of Derivatives Not Designated as Hedging Instruments (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2026 USD ($) MMBTU Boe	Dec. 31, 2025 USD ($) Boe MMBTU
Derivative [Line Items]
Derivative assets - fair value	$ 387,420	$ 409,467
Derivative liabilities - fair value	407,529	385,973
Customer-related positions:
Derivative [Line Items]
Notional Amount	10,984,111	11,480,222
Derivative assets - fair value	41,752	84,692
Derivative liabilities - fair value	263,647	212,279
Economic hedges and other:
Derivative [Line Items]
Notional Amount	11,970,590	12,057,156
Derivative assets - fair value	271,643	218,209
Derivative liabilities - fair value	46,399	87,612
Interest rate contracts | Customer-related positions:
Derivative [Line Items]
Notional Amount	8,842,165	9,474,603
Derivative assets - fair value	12,453	47,759
Derivative liabilities - fair value	240,747	208,714
Interest rate contracts | Economic hedges and other:
Derivative [Line Items]
Notional Amount	8,879,971	9,512,674
Derivative assets - fair value	240,673	210,802
Derivative liabilities - fair value	12,915	48,017
Interest rate contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional Amount	7,213,744	7,566,889
Derivative assets - fair value	12,378	47,448
Derivative liabilities - fair value	234,791	206,794
Interest rate contracts | Swaps | Economic hedges and other:
Derivative [Line Items]
Notional Amount	7,251,550	7,604,959
Derivative assets - fair value	234,667	208,860
Derivative liabilities - fair value	12,839	47,682
Interest rate contracts | Written options | Customer-related positions:
Derivative [Line Items]
Notional Amount	1,280,551	1,463,110
Derivative assets - fair value	0	0
Derivative liabilities - fair value	5,261	1,900
Interest rate contracts | Collars and corridors | Customer-related positions:
Derivative [Line Items]
Notional Amount	347,870	444,604
Derivative assets - fair value	75	311
Derivative liabilities - fair value	695	20
Interest rate contracts | Collars and corridors | Economic hedges and other:
Derivative [Line Items]
Notional Amount	347,870	444,605
Derivative assets - fair value	704	20
Derivative liabilities - fair value	76	335
Interest rate contracts | Purchased options | Economic hedges and other:
Derivative [Line Items]
Notional Amount	1,280,551	1,463,110
Derivative assets - fair value	5,302	1,922
Derivative liabilities - fair value	0	0
Foreign exchange contracts | Customer-related positions:
Derivative [Line Items]
Notional Amount	2,141,946	2,005,619
Derivative assets - fair value	29,299	36,933
Derivative liabilities - fair value	22,900	3,565
Foreign exchange contracts | Economic hedges and other:
Derivative [Line Items]
Notional Amount	3,090,619	2,544,482
Derivative assets - fair value	30,970	7,407
Derivative liabilities - fair value	33,484	39,595
Foreign exchange contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional Amount	769,619	785,956
Derivative assets - fair value	8,406	13,272
Derivative liabilities - fair value	9,359	661
Foreign exchange contracts | Swaps | Economic hedges and other:
Derivative [Line Items]
Notional Amount	2,767,071	2,246,744
Derivative assets - fair value	24,011	5,718
Derivative liabilities - fair value	28,644	36,083
Foreign exchange contracts | Written options | Customer-related positions:
Derivative [Line Items]
Notional Amount	65,330	63,460
Derivative assets - fair value	0	0
Derivative liabilities - fair value	2,201	73
Foreign exchange contracts | Forwards and spot | Customer-related positions:
Derivative [Line Items]
Notional Amount	1,306,997	1,156,203
Derivative assets - fair value	20,893	23,661
Derivative liabilities - fair value	11,340	2,831
Foreign exchange contracts | Forwards and spot | Economic hedges and other:
Derivative [Line Items]
Notional Amount	258,218	234,278
Derivative assets - fair value	4,755	1,602
Derivative liabilities - fair value	4,837	3,498
Foreign exchange contracts | Purchased options | Economic hedges and other:
Derivative [Line Items]
Notional Amount	65,330	63,460
Derivative assets - fair value	2,204	87
Derivative liabilities - fair value	3	14
Commodity contracts | Customer-related positions:
Derivative [Line Items]
Derivative assets - fair value	37,592	7,919
Derivative liabilities - fair value	39,437	67,251
Commodity contracts | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - fair value	30,694	226
Derivative liabilities - fair value	$ 11,197	$ 42,155
Derivative, nonmonetary notional amount, energy measure | Boe	7,589	8,002
Commodity contracts | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - fair value	$ 6,898	$ 7,693
Derivative liabilities - fair value	$ 28,240	$ 25,096
Derivative, nonmonetary notional amount, energy measure | MMBTU	127,779	184,544
Commodity contracts | Economic hedges and other:
Derivative [Line Items]
Derivative assets - fair value	$ 27,502	$ 58,103
Derivative liabilities - fair value	27,436	4,907
Commodity contracts | Economic hedges and other: | Crude Oil
Derivative [Line Items]
Derivative assets - fair value	6,884	34,033
Derivative liabilities - fair value	$ 18,067	$ 32
Derivative, nonmonetary notional amount, energy measure | Boe	7,596	8,002
Commodity contracts | Economic hedges and other: | Natural Gas
Derivative [Line Items]
Derivative assets - fair value	$ 20,618	$ 24,070
Derivative liabilities - fair value	$ 9,369	$ 4,875
Derivative, nonmonetary notional amount, energy measure | MMBTU	144,254	179,471
Commodity contracts | Swaps | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - fair value	$ 19,883	$ 205
Derivative liabilities - fair value	$ 10,940	$ 28,533
Derivative, nonmonetary notional amount, energy measure | Boe	5,878	4,255
Commodity contracts | Swaps | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - fair value	$ 6,828	$ 5,814
Derivative liabilities - fair value	$ 22,132	$ 18,403
Derivative, nonmonetary notional amount, energy measure | MMBTU	93,345	112,599
Commodity contracts | Swaps | Economic hedges and other: | Crude Oil
Derivative [Line Items]
Derivative assets - fair value	$ 6,608	$ 25,309
Derivative liabilities - fair value	$ 13,978	$ 11
Derivative, nonmonetary notional amount, energy measure | Boe	5,878	4,255
Commodity contracts | Swaps | Economic hedges and other: | Natural Gas
Derivative [Line Items]
Derivative assets - fair value	$ 16,236	$ 18,258
Derivative liabilities - fair value	$ 7,614	$ 3,963
Derivative, nonmonetary notional amount, energy measure | MMBTU	100,200	110,506
Commodity contracts | Collars | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - fair value	$ 10,811	$ 21
Derivative liabilities - fair value	$ 257	$ 13,622
Derivative, nonmonetary notional amount, energy measure | Boe	1,711	3,747
Commodity contracts | Collars | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - fair value	$ 70	$ 1,879
Derivative liabilities - fair value	$ 6,108	$ 6,693
Derivative, nonmonetary notional amount, energy measure | MMBTU	34,434	71,945
Commodity contracts | Collars | Economic hedges and other: | Crude Oil
Derivative [Line Items]
Derivative assets - fair value	$ 276	$ 8,724
Derivative liabilities - fair value	$ 4,089	$ 21
Derivative, nonmonetary notional amount, energy measure | Boe	1,718	3,747
Commodity contracts | Collars | Economic hedges and other: | Natural Gas
Derivative [Line Items]
Derivative assets - fair value	$ 4,382	$ 5,812
Derivative liabilities - fair value	$ 1,755	$ 912
Derivative, nonmonetary notional amount, energy measure | MMBTU	44,054	68,965