Derivatives - Derivatives Not Designated as Hedging Instruments (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) MMBTU Boe	Dec. 31, 2022 USD ($) MMBTU Boe
Derivative [Line Items]
Gross amounts recognized	$ 862,316	$ 755,328
Derivative liabilities - Fair value	$ 948,387	$ 887,264
Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	20,672	12,005
Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	363,020	247,704
Customer-related positions:
Derivative [Line Items]
Notional amount	$ 11,383,158	$ 10,158,784
Gross amounts recognized	33,979	27,146
Derivative liabilities - Fair value	662,616	592,060
Other economic hedges:
Derivative [Line Items]
Notional amount	11,277,951	9,756,521
Gross amounts recognized	685,488	447,201
Derivative liabilities - Fair value	30,403	16,886
Interest rate contracts | Customer-related positions:
Derivative [Line Items]
Notional amount	8,684,404	8,420,422
Gross amounts recognized	691	1,438
Derivative liabilities - Fair value	614,445	561,547
Interest rate contracts | Other economic hedges:
Derivative [Line Items]
Notional amount	8,771,698	8,511,992
Gross amounts recognized	622,108	425,390
Derivative liabilities - Fair value	1,475	3,282
Interest rate contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional amount	6,890,450	6,656,491
Gross amounts recognized	691	1,438
Derivative liabilities - Fair value	584,962	521,719
Interest rate contracts | Swaps | Other economic hedges:
Derivative [Line Items]
Notional amount	6,916,364	6,683,828
Gross amounts recognized	592,177	384,201
Derivative liabilities - Fair value	1,119	2,047
Interest rate contracts | Written options | Customer-related positions:
Derivative [Line Items]
Notional amount	1,486,958	1,548,158
Gross amounts recognized	0	0
Derivative liabilities - Fair value	21,864	30,904
Interest rate contracts | Written options | Other economic hedges:
Derivative [Line Items]
Notional amount	30,690	32,117
Gross amounts recognized	0	0
Derivative liabilities - Fair value	356	1,235
Interest rate contracts | Collars and corridors | Customer-related positions:
Derivative [Line Items]
Notional amount	306,996	215,773
Gross amounts recognized	0	0
Derivative liabilities - Fair value	7,619	8,924
Interest rate contracts | Collars and corridors | Other economic hedges:
Derivative [Line Items]
Notional amount	306,996	215,772
Gross amounts recognized	7,646	8,956
Derivative liabilities - Fair value	0	0
Interest rate contracts | Purchased options | Other economic hedges:
Derivative [Line Items]
Notional amount	1,517,648	1,580,275
Gross amounts recognized	22,285	32,233
Derivative liabilities - Fair value	0	0
Foreign exchange contracts | Customer-related positions:
Derivative [Line Items]
Notional amount	2,698,754	1,738,362
Gross amounts recognized	33,288	25,708
Derivative liabilities - Fair value	48,171	30,513
Foreign exchange contracts | Other economic hedges:
Derivative [Line Items]
Notional amount	2,506,253	1,244,529
Gross amounts recognized	63,380	21,811
Derivative liabilities - Fair value	28,928	13,604
Foreign exchange contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional amount	2,494,517	623,143
Gross amounts recognized	16,282	6,629
Derivative liabilities - Fair value	23,687	12,178
Foreign exchange contracts | Swaps | Other economic hedges:
Derivative [Line Items]
Notional amount	1,303,755	1,044,900
Gross amounts recognized	62,928	18,516
Derivative liabilities - Fair value	22,985	11,447
Foreign exchange contracts | Forwards and spot | Customer-related positions:
Derivative [Line Items]
Notional amount	62,237	993,588
Gross amounts recognized	11,376	17,009
Derivative liabilities - Fair value	24,484	18,090
Foreign exchange contracts | Forwards and spot | Other economic hedges:
Derivative [Line Items]
Notional amount	1,060,498	77,998
Gross amounts recognized	452	3,050
Derivative liabilities - Fair value	313	87
Foreign exchange contracts | Other | Customer-related positions:
Derivative [Line Items]
Notional amount	142,000	121,631
Gross amounts recognized	5,630	2,070
Derivative liabilities - Fair value	0	245
Foreign exchange contracts | Other | Other economic hedges:
Derivative [Line Items]
Notional amount	142,000	121,631
Gross amounts recognized	0	245
Derivative liabilities - Fair value	5,630	2,070
Commodity contracts | Customer-related positions:
Derivative [Line Items]
Gross amounts recognized	85,388	171,082
Derivative liabilities - Fair value	$ 68,964	$ 100,333
Commodity contracts | Customer-related positions: | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	10,320	5,476
Gross amounts recognized	$ 52,095	$ 56,551
Derivative liabilities - Fair value	$ 1,836	$ 8,808
Commodity contracts | Customer-related positions: | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	182,658	124,662
Gross amounts recognized	$ 33,293	$ 114,531
Derivative liabilities - Fair value	67,128	91,525
Commodity contracts | Other economic hedges:
Derivative [Line Items]
Gross amounts recognized	52,112	90,531
Derivative liabilities - Fair value	$ 74,891	$ 158,275
Commodity contracts | Other economic hedges: | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	10,352	6,529
Gross amounts recognized	$ 2,165	$ 8,313
Derivative liabilities - Fair value	$ 43,184	$ 49,432
Commodity contracts | Other economic hedges: | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	180,363	123,042
Gross amounts recognized	$ 49,947	$ 82,218
Derivative liabilities - Fair value	$ 31,707	$ 108,843
Commodity contracts | Swaps | Customer-related positions: | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	3,958	2,465
Gross amounts recognized	$ 27,543	$ 39,955
Derivative liabilities - Fair value	$ 1,717	$ 6,178
Commodity contracts | Swaps | Customer-related positions: | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	129,940	92,590
Gross amounts recognized	$ 32,428	$ 112,314
Derivative liabilities - Fair value	$ 55,387	$ 73,208
Commodity contracts | Swaps | Other economic hedges: | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	3,990	2,587
Gross amounts recognized	$ 2,165	$ 6,935
Derivative liabilities - Fair value	$ 24,403	$ 36,060
Commodity contracts | Swaps | Other economic hedges: | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	129,405	91,900
Gross amounts recognized	$ 42,804	$ 69,767
Derivative liabilities - Fair value	$ 31,289	$ 106,883
Commodity contracts | Written options | Customer-related positions: | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	0	0
Gross amounts recognized	$ 0	$ 558
Derivative liabilities - Fair value	$ 0	$ 0
Commodity contracts | Written options | Customer-related positions: | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	1,955	0
Gross amounts recognized	$ 0	$ 0
Derivative liabilities - Fair value	$ 206	$ 0
Commodity contracts | Purchased options | Other economic hedges: | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	0	0
Gross amounts recognized	$ 0	$ 0
Derivative liabilities - Fair value	$ 0	$ 516
Commodity contracts | Purchased options | Other economic hedges: | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	1,955	0
Gross amounts recognized	$ 206	$ 0
Derivative liabilities - Fair value	$ 0	$ 0
Commodity contracts | Collars | Customer-related positions: | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	6,362	3,011
Gross amounts recognized	$ 24,552	$ 16,038
Derivative liabilities - Fair value	$ 119	$ 2,630
Commodity contracts | Collars | Customer-related positions: | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	50,763	32,072
Gross amounts recognized	$ 865	$ 2,217
Derivative liabilities - Fair value	$ 11,535	$ 18,317
Commodity contracts | Collars | Other economic hedges: | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	6,362	3,942
Gross amounts recognized	$ 0	$ 1,378
Derivative liabilities - Fair value	$ 18,781	$ 12,856
Commodity contracts | Collars | Other economic hedges: | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	49,003	31,142
Gross amounts recognized	$ 6,937	$ 12,451
Derivative liabilities - Fair value	$ 418	$ 1,960