Derivatives - Derivatives Not Designated as Hedging Instruments (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) MMBTU Boe	Dec. 31, 2023 USD ($) Boe MMBTU
Derivative [Line Items]
Gross amounts recognized	$ 622,238	$ 610,920
Derivative liabilities - Fair value	$ 693,548	$ 613,314
Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	18,468	18,631
Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	350,942	328,844
Customer-related positions:
Derivative [Line Items]
Notional amount	$ 10,791,750	$ 11,362,194
Gross amounts recognized	35,375	43,195
Derivative liabilities - Fair value	490,627	419,499
Other economic hedges:
Derivative [Line Items]
Notional amount	11,017,141	11,852,864
Gross amounts recognized	494,211	433,969
Derivative liabilities - Fair value	31,240	43,877
Interest rate contracts | Customer-related positions:
Derivative [Line Items]
Notional amount	8,442,370	8,681,085
Gross amounts recognized	9,651	26,089
Derivative liabilities - Fair value	458,240	394,625
Interest rate contracts | Other economic hedges:
Derivative [Line Items]
Notional amount	8,468,092	8,706,824
Gross amounts recognized	459,436	397,397
Derivative liabilities - Fair value	10,474	26,187
Interest rate contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional amount	6,874,132	6,835,822
Gross amounts recognized	9,521	25,649
Derivative liabilities - Fair value	442,960	377,388
Interest rate contracts | Swaps | Other economic hedges:
Derivative [Line Items]
Notional amount	6,899,692	6,861,561
Gross amounts recognized	444,094	380,123
Derivative liabilities - Fair value	10,337	25,731
Interest rate contracts | Written options | Customer-related positions:
Derivative [Line Items]
Notional amount	1,287,121	1,522,531
Gross amounts recognized	0	0
Derivative liabilities - Fair value	11,909	12,756
Interest rate contracts | Collars and corridors | Customer-related positions:
Derivative [Line Items]
Notional amount	281,117	322,732
Gross amounts recognized	130	440
Derivative liabilities - Fair value	3,371	4,481
Interest rate contracts | Collars and corridors | Other economic hedges:
Derivative [Line Items]
Notional amount	281,117	322,732
Gross amounts recognized	3,380	4,491
Derivative liabilities - Fair value	137	456
Interest rate contracts | Purchased options | Other economic hedges:
Derivative [Line Items]
Notional amount	1,287,283	1,522,531
Gross amounts recognized	11,962	12,783
Derivative liabilities - Fair value	0	0
Foreign exchange contracts | Customer-related positions:
Derivative [Line Items]
Notional amount	2,349,380	2,681,109
Gross amounts recognized	25,724	17,106
Derivative liabilities - Fair value	32,387	24,874
Foreign exchange contracts | Other economic hedges:
Derivative [Line Items]
Notional amount	2,549,049	3,146,040
Gross amounts recognized	34,775	36,572
Derivative liabilities - Fair value	20,766	17,690
Foreign exchange contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional amount	1,577,082	1,588,491
Gross amounts recognized	19,020	5,801
Derivative liabilities - Fair value	24,839	18,118
Foreign exchange contracts | Swaps | Other economic hedges:
Derivative [Line Items]
Notional amount	2,387,046	2,862,037
Gross amounts recognized	34,733	36,280
Derivative liabilities - Fair value	18,168	15,757
Foreign exchange contracts | Written options | Other economic hedges:
Derivative [Line Items]
Notional amount	129,000	136,000
Gross amounts recognized	0	0
Derivative liabilities - Fair value	2,580	1,839
Foreign exchange contracts | Forwards and spot | Customer-related positions:
Derivative [Line Items]
Notional amount	643,298	956,618
Gross amounts recognized	4,124	9,466
Derivative liabilities - Fair value	7,548	6,756
Foreign exchange contracts | Forwards and spot | Other economic hedges:
Derivative [Line Items]
Notional amount	33,003	148,003
Gross amounts recognized	42	292
Derivative liabilities - Fair value	18	94
Foreign exchange contracts | Purchased options | Customer-related positions:
Derivative [Line Items]
Notional amount	129,000	136,000
Gross amounts recognized	2,580	1,839
Derivative liabilities - Fair value	0	0
Commodity contracts | Customer-related positions:
Derivative [Line Items]
Gross amounts recognized	29,495	6,014
Derivative liabilities - Fair value	87,968	114,974
Commodity contracts | Customer-related positions: | Crude oil
Derivative [Line Items]
Gross amounts recognized	27,271	5,555
Derivative liabilities - Fair value	$ 800	$ 20,548
Derivative, nonmonetary notional amount, energy measure | Boe	9,184	9,243
Commodity contracts | Customer-related positions: | Natural gas
Derivative [Line Items]
Gross amounts recognized	$ 2,224	$ 459
Derivative liabilities - Fair value	$ 87,168	$ 94,426
Derivative, nonmonetary notional amount, energy measure | MMBTU	177,031	166,053
Commodity contracts | Other economic hedges:
Derivative [Line Items]
Gross amounts recognized	$ 47,120	$ 73,590
Derivative liabilities - Fair value	18,962	6,696
Commodity contracts | Other economic hedges: | Crude oil
Derivative [Line Items]
Gross amounts recognized	1,789	10,851
Derivative liabilities - Fair value	$ 17,899	$ 6,391
Derivative, nonmonetary notional amount, energy measure | Boe	9,284	9,388
Commodity contracts | Other economic hedges: | Natural gas
Derivative [Line Items]
Gross amounts recognized	$ 45,331	$ 62,739
Derivative liabilities - Fair value	$ 1,063	$ 305
Derivative, nonmonetary notional amount, energy measure | MMBTU	173,911	162,791
Commodity contracts | Swaps | Customer-related positions: | Crude oil
Derivative [Line Items]
Gross amounts recognized	$ 15,370	$ 3,735
Derivative liabilities - Fair value	$ 685	$ 15,445
Derivative, nonmonetary notional amount, energy measure | Boe	3,608	3,277
Commodity contracts | Swaps | Customer-related positions: | Natural gas
Derivative [Line Items]
Gross amounts recognized	$ 1,420	$ 438
Derivative liabilities - Fair value	$ 70,028	$ 73,793
Derivative, nonmonetary notional amount, energy measure | MMBTU	127,102	118,325
Commodity contracts | Swaps | Other economic hedges: | Crude oil
Derivative [Line Items]
Gross amounts recognized	$ 1,788	$ 9,166
Derivative liabilities - Fair value	$ 12,997	$ 4,924
Derivative, nonmonetary notional amount, energy measure | Boe	3,708	3,422
Commodity contracts | Swaps | Other economic hedges: | Natural gas
Derivative [Line Items]
Gross amounts recognized	$ 37,170	$ 49,941
Derivative liabilities - Fair value	$ 629	$ 305
Derivative, nonmonetary notional amount, energy measure | MMBTU	124,582	116,463
Commodity contracts | Written options | Customer-related positions: | Natural gas
Derivative [Line Items]
Gross amounts recognized	$ 132	$ 0
Derivative liabilities - Fair value	$ 33	$ 233
Derivative, nonmonetary notional amount, energy measure | MMBTU	1,976	1,874
Commodity contracts | Purchased options | Other economic hedges: | Natural gas
Derivative [Line Items]
Gross amounts recognized	$ 41	$ 233
Derivative liabilities - Fair value	$ 116	$ 0
Derivative, nonmonetary notional amount, energy measure | MMBTU	1,976	1,874
Commodity contracts | Collars | Customer-related positions: | Crude oil
Derivative [Line Items]
Gross amounts recognized	$ 11,901	$ 1,820
Derivative liabilities - Fair value	$ 115	$ 5,103
Derivative, nonmonetary notional amount, energy measure | Boe	5,576	5,966
Commodity contracts | Collars | Customer-related positions: | Natural gas
Derivative [Line Items]
Gross amounts recognized	$ 672	$ 21
Derivative liabilities - Fair value	$ 17,107	$ 20,400
Derivative, nonmonetary notional amount, energy measure | MMBTU	47,953	45,854
Commodity contracts | Collars | Other economic hedges: | Crude oil
Derivative [Line Items]
Gross amounts recognized	$ 1	$ 1,685
Derivative liabilities - Fair value	$ 4,902	$ 1,467
Derivative, nonmonetary notional amount, energy measure | Boe	5,576	5,966
Commodity contracts | Collars | Other economic hedges: | Natural gas
Derivative [Line Items]
Gross amounts recognized	$ 8,120	$ 12,565
Derivative liabilities - Fair value	$ 318	$ 0
Derivative, nonmonetary notional amount, energy measure | MMBTU	47,353	44,454