Derivatives - Derivatives Not Designated as Hedging Instruments (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Boe MMBTU	Dec. 31, 2022 USD ($) MMBTU Boe
Derivative [Line Items]
Derivative assets - Fair value	$ 610,920	$ 755,328
Derivative liabilities - Fair Value	$ 613,314	$ 887,264
Crude Oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	18,631	12,005
Natural Gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	328,844	247,704
Customer-related positions:
Derivative [Line Items]
Notional amount	$ 11,362,194	$ 10,158,784
Derivative assets - Fair value	43,195	27,146
Derivative liabilities - Fair Value	419,499	592,060
Other economic hedges:
Derivative [Line Items]
Notional amount	11,852,864	9,756,521
Derivative assets - Fair value	433,969	447,201
Derivative liabilities - Fair Value	43,877	16,886
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	23,333,449	20,056,255
Derivative assets - Fair value	557,105	736,283
Derivative liabilities - Fair Value	600,190	867,577
Interest rate contracts | Customer-related positions:
Derivative [Line Items]
Notional amount	8,681,085	8,420,422
Derivative assets - Fair value	26,089	1,438
Derivative liabilities - Fair Value	394,625	561,547
Interest rate contracts | Other economic hedges:
Derivative [Line Items]
Notional amount	8,706,824	8,511,992
Derivative assets - Fair value	397,397	425,390
Derivative liabilities - Fair Value	26,187	3,282
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	17,387,909	16,932,414
Derivative assets - Fair value	423,486	426,828
Derivative liabilities - Fair Value	420,812	564,829
Interest rate contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional amount	6,835,822	6,656,491
Derivative assets - Fair value	25,649	1,438
Derivative liabilities - Fair Value	377,388	521,719
Interest rate contracts | Swaps | Other economic hedges:
Derivative [Line Items]
Notional amount	6,861,561	6,683,828
Derivative assets - Fair value	380,123	384,201
Derivative liabilities - Fair Value	25,731	2,047
Interest rate contracts | Written options | Customer-related positions:
Derivative [Line Items]
Notional amount	1,522,531	1,548,158
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	12,756	30,904
Interest rate contracts | Written options | Other economic hedges:
Derivative [Line Items]
Notional amount	0	32,117
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0	1,235
Interest rate contracts | Collars and corridors | Customer-related positions:
Derivative [Line Items]
Notional amount	322,732	215,773
Derivative assets - Fair value	440	0
Derivative liabilities - Fair Value	4,481	8,924
Interest rate contracts | Collars and corridors | Other economic hedges:
Derivative [Line Items]
Notional amount	322,732	215,772
Derivative assets - Fair value	4,491	8,956
Derivative liabilities - Fair Value	456	0
Interest rate contracts | Purchased options | Other economic hedges:
Derivative [Line Items]
Notional amount	1,522,531	1,580,275
Derivative assets - Fair value	12,783	32,233
Derivative liabilities - Fair Value	0	0
Commodity contracts | Customer-related positions:
Derivative [Line Items]
Derivative assets - Fair value	6,014	171,082
Derivative liabilities - Fair Value	114,974	100,333
Commodity contracts | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	5,555	56,551
Derivative liabilities - Fair Value	$ 20,548	$ 8,808
Derivative, nonmonetary notional amount, energy measure | Boe	9,243	5,476
Commodity contracts | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 459	$ 114,531
Derivative liabilities - Fair Value	$ 94,426	$ 91,525
Derivative, nonmonetary notional amount, energy measure | MMBTU	166,053	124,662
Commodity contracts | Other economic hedges:
Derivative [Line Items]
Derivative assets - Fair value	$ 73,590	$ 90,531
Derivative liabilities - Fair Value	6,696	158,275
Commodity contracts | Other economic hedges: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	10,851	8,313
Derivative liabilities - Fair Value	$ 6,391	$ 49,432
Derivative, nonmonetary notional amount, energy measure | Boe	9,388	6,529
Commodity contracts | Other economic hedges: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 62,739	$ 82,218
Derivative liabilities - Fair Value	$ 305	$ 108,843
Derivative, nonmonetary notional amount, energy measure | MMBTU	162,791	123,042
Commodity contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	$ 0	$ 0
Derivative assets - Fair value	79,604	261,613
Derivative liabilities - Fair Value	121,670	258,608
Commodity contracts | Swaps | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	3,735	39,955
Derivative liabilities - Fair Value	$ 15,445	$ 6,178
Derivative, nonmonetary notional amount, energy measure | Boe	3,277	2,465
Commodity contracts | Swaps | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 438	$ 112,314
Derivative liabilities - Fair Value	$ 73,793	$ 73,208
Derivative, nonmonetary notional amount, energy measure | MMBTU	118,325	92,590
Commodity contracts | Swaps | Other economic hedges: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 9,166	$ 6,935
Derivative liabilities - Fair Value	$ 4,924	$ 36,060
Derivative, nonmonetary notional amount, energy measure | Boe	3,422	2,587
Commodity contracts | Swaps | Other economic hedges: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 49,941	$ 69,767
Derivative liabilities - Fair Value	$ 305	$ 106,883
Derivative, nonmonetary notional amount, energy measure | MMBTU	116,463	91,900
Commodity contracts | Collars | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 1,820	$ 16,038
Derivative liabilities - Fair Value	$ 5,103	$ 2,630
Derivative, nonmonetary notional amount, energy measure | Boe	5,966	3,011
Commodity contracts | Collars | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 21	$ 2,217
Derivative liabilities - Fair Value	$ 20,400	$ 18,317
Derivative, nonmonetary notional amount, energy measure | MMBTU	45,854	32,072
Commodity contracts | Collars | Other economic hedges: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 1,685	$ 1,378
Derivative liabilities - Fair Value	$ 1,467	$ 12,856
Derivative, nonmonetary notional amount, energy measure | Boe	5,966	3,942
Commodity contracts | Collars | Other economic hedges: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 12,565	$ 12,451
Derivative liabilities - Fair Value	$ 0	$ 1,960
Derivative, nonmonetary notional amount, energy measure | MMBTU	44,454	31,142
Commodity contracts | Written options | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 0	$ 558
Derivative liabilities - Fair Value	$ 0	$ 0
Derivative, nonmonetary notional amount, energy measure | Boe	0	0
Commodity contracts | Written options | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 0	$ 0
Derivative liabilities - Fair Value	$ 233	$ 0
Derivative, nonmonetary notional amount, energy measure | MMBTU	1,874	0
Commodity contracts | Purchased options | Other economic hedges: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 0	$ 0
Derivative liabilities - Fair Value	$ 0	$ 516
Derivative, nonmonetary notional amount, energy measure | Boe	0	0
Commodity contracts | Purchased options | Other economic hedges: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 233	$ 0
Derivative liabilities - Fair Value	$ 0	$ 0
Derivative, nonmonetary notional amount, energy measure | MMBTU	1,874	0
Foreign exchange contracts | Customer-related positions:
Derivative [Line Items]
Notional amount	$ 2,681,109	$ 1,738,362
Derivative assets - Fair value	17,106	25,708
Derivative liabilities - Fair Value	24,874	30,513
Foreign exchange contracts | Other economic hedges:
Derivative [Line Items]
Notional amount	3,146,040	1,244,529
Derivative assets - Fair value	36,572	21,811
Derivative liabilities - Fair Value	17,690	13,604
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	5,827,149	2,982,891
Derivative assets - Fair value	53,678	47,519
Derivative liabilities - Fair Value	42,564	44,117
Foreign exchange contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional amount	1,588,491	623,143
Derivative assets - Fair value	5,801	6,629
Derivative liabilities - Fair Value	18,118	12,178
Foreign exchange contracts | Swaps | Other economic hedges:
Derivative [Line Items]
Notional amount	2,862,037	1,044,900
Derivative assets - Fair value	36,280	18,516
Derivative liabilities - Fair Value	15,757	11,447
Foreign exchange contracts | Forwards and spot | Customer-related positions:
Derivative [Line Items]
Notional amount	956,618	993,588
Derivative assets - Fair value	9,466	17,009
Derivative liabilities - Fair Value	6,756	18,090
Foreign exchange contracts | Forwards and spot | Other economic hedges:
Derivative [Line Items]
Notional amount	148,003	77,998
Derivative assets - Fair value	292	3,050
Derivative liabilities - Fair Value	94	87
Foreign exchange contracts | Other | Customer-related positions:
Derivative [Line Items]
Notional amount	136,000	121,631
Derivative assets - Fair value	1,839	2,070
Derivative liabilities - Fair Value	0	245
Foreign exchange contracts | Other | Other economic hedges:
Derivative [Line Items]
Notional amount	136,000	121,631
Derivative assets - Fair value	0	245
Derivative liabilities - Fair Value	1,839	2,070
Credit Risk Contract | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	118,391	140,950
Derivative assets - Fair value	1	0
Derivative liabilities - Fair Value	25	23
Credit Risk Contract | Derivatives not designated as hedging instruments: | RPAs - protection sold
Derivative [Line Items]
Notional amount	$ 25,000	$ 0