Loans and Allowance for Loan Losses - Schedule of Loan Portfolio Class by Risk Grade and Origination Year (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	$ 11,356		$ 11,356		$ 11,306
Term loans amortized cost basis by origination, before current fiscal year	17,057		17,057		5,091
Term loans amortized cost basis by origination, two years before current fiscal year	7,860		7,860		3,480
Term loans amortized cost basis by origination, three years before current fiscal year	5,757		5,757		6,201
Term loans amortized cost basis by origination, four years before current fiscal year	9,866		9,866		3,256
Term loans amortized cost basis by origination, prior	16,437		16,437		2,163
Amortized Cost Basis	19,743		19,743		7,657
Total	88,076		88,076		39,154
Gross charge-offs
Year One			1		4
Year Two			17		8
Year Three			30		12
Year Four			13		15
Year Five			9		28
Prior			17		4
Amortized Cost Basis			28		25
Total	58	$ 24	115	$ 40	96
Total commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	6,906		6,906		6,939
Term loans amortized cost basis by origination, before current fiscal year	10,017		10,017		3,528
Term loans amortized cost basis by origination, two years before current fiscal year	4,785		4,785		1,996
Term loans amortized cost basis by origination, three years before current fiscal year	3,329		3,329		2,043
Term loans amortized cost basis by origination, four years before current fiscal year	3,478		3,478		1,207
Term loans amortized cost basis by origination, prior	6,940		6,940		963
Amortized Cost Basis	15,660		15,660		5,620
Total	51,115		51,115		22,296
Gross charge-offs
Year One			1		4
Year Two			13		8
Year Three			27		11
Year Four			11		15
Year Five			7		7
Prior			9		2
Amortized Cost Basis			20		19
Total			88		66
Total commercial and industrial \| Commercial, financial and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	5,209		5,209		5,292
Term loans amortized cost basis by origination, before current fiscal year	6,639		6,639		2,757
Term loans amortized cost basis by origination, two years before current fiscal year	3,260		3,260		1,282
Term loans amortized cost basis by origination, three years before current fiscal year	1,892		1,892		951
Term loans amortized cost basis by origination, four years before current fiscal year	1,367		1,367		467
Term loans amortized cost basis by origination, prior	3,391		3,391		340
Amortized Cost Basis	14,918		14,918		5,460
Total	36,676		36,676		16,549
Gross charge-offs
Year One			1		4
Year Two			13		7
Year Three			27		11
Year Four			11		15
Year Five			6		7
Prior			5		2
Amortized Cost Basis			20		19
Total			83		65
Total commercial and industrial \| Commercial, financial and agricultural \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	5,184		5,184		5,207
Term loans amortized cost basis by origination, before current fiscal year	6,574		6,574		2,722
Term loans amortized cost basis by origination, two years before current fiscal year	3,175		3,175		1,219
Term loans amortized cost basis by origination, three years before current fiscal year	1,695		1,695		901
Term loans amortized cost basis by origination, four years before current fiscal year	1,298		1,298		450
Term loans amortized cost basis by origination, prior	3,317		3,317		334
Amortized Cost Basis	14,569		14,569		5,323
Total	35,812		35,812		16,156
Total commercial and industrial \| Commercial, financial and agricultural \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	22		22		54
Term loans amortized cost basis by origination, before current fiscal year	16		16		29
Term loans amortized cost basis by origination, two years before current fiscal year	55		55		51
Term loans amortized cost basis by origination, three years before current fiscal year	123		123		39
Term loans amortized cost basis by origination, four years before current fiscal year	21		21		14
Term loans amortized cost basis by origination, prior	17		17		2
Amortized Cost Basis	173		173		118
Total	427		427		307
Total commercial and industrial \| Commercial, financial and agricultural \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	3		3		31
Term loans amortized cost basis by origination, before current fiscal year	49		49		6
Term loans amortized cost basis by origination, two years before current fiscal year	30		30		12
Term loans amortized cost basis by origination, three years before current fiscal year	74		74		11
Term loans amortized cost basis by origination, four years before current fiscal year	48		48		3
Term loans amortized cost basis by origination, prior	54		54		4
Amortized Cost Basis	167		167		19
Total	425		425		86
Total commercial and industrial \| Commercial, financial and agricultural \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0
Term loans amortized cost basis by origination, four years before current fiscal year	0		0
Term loans amortized cost basis by origination, prior	3		3
Amortized Cost Basis	8		8
Total	11		11
Total commercial and industrial \| Commercial, financial and agricultural \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0
Term loans amortized cost basis by origination, four years before current fiscal year	0		0
Term loans amortized cost basis by origination, prior	0		0
Amortized Cost Basis	1		1
Total	1		1
Total commercial and industrial \| Owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	1,697		1,697		1,647
Term loans amortized cost basis by origination, before current fiscal year	3,378		3,378		771
Term loans amortized cost basis by origination, two years before current fiscal year	1,525		1,525		714
Term loans amortized cost basis by origination, three years before current fiscal year	1,437		1,437		1,092
Term loans amortized cost basis by origination, four years before current fiscal year	2,111		2,111		740
Term loans amortized cost basis by origination, prior	3,549		3,549		623
Amortized Cost Basis	742		742		160
Total	14,439		14,439		5,747
Gross charge-offs
Year One			0		0
Year Two			0		1
Year Three			0		0
Year Four			0		0
Year Five			1		0
Prior			4		0
Amortized Cost Basis			0		0
Total			5		1
Total commercial and industrial \| Owner-occupied \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	1,682		1,682		1,621
Term loans amortized cost basis by origination, before current fiscal year	3,359		3,359		770
Term loans amortized cost basis by origination, two years before current fiscal year	1,518		1,518		700
Term loans amortized cost basis by origination, three years before current fiscal year	1,391		1,391		1,079
Term loans amortized cost basis by origination, four years before current fiscal year	2,059		2,059		691
Term loans amortized cost basis by origination, prior	3,341		3,341		596
Amortized Cost Basis	737		737		160
Total	14,087		14,087		5,617
Total commercial and industrial \| Owner-occupied \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	15		15		26
Term loans amortized cost basis by origination, before current fiscal year	15		15		1
Term loans amortized cost basis by origination, two years before current fiscal year	6		6		11
Term loans amortized cost basis by origination, three years before current fiscal year	28		28		13
Term loans amortized cost basis by origination, four years before current fiscal year	30		30		33
Term loans amortized cost basis by origination, prior	113		113		25
Amortized Cost Basis	2		2		0
Total	209		209		109
Total commercial and industrial \| Owner-occupied \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0		0
Term loans amortized cost basis by origination, before current fiscal year	4		4		0
Term loans amortized cost basis by origination, two years before current fiscal year	1		1		3
Term loans amortized cost basis by origination, three years before current fiscal year	18		18		0
Term loans amortized cost basis by origination, four years before current fiscal year	22		22		16
Term loans amortized cost basis by origination, prior	76		76		2
Amortized Cost Basis	3		3		0
Total	124		124		21
Total commercial and industrial \| Owner-occupied \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0
Term loans amortized cost basis by origination, four years before current fiscal year	0		0
Term loans amortized cost basis by origination, prior	19		19
Amortized Cost Basis	0		0
Total	19		19
Total commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	3,301		3,301		3,270
Term loans amortized cost basis by origination, before current fiscal year	5,523		5,523		1,363
Term loans amortized cost basis by origination, two years before current fiscal year	2,486		2,486		1,133
Term loans amortized cost basis by origination, three years before current fiscal year	1,520		1,520		3,498
Term loans amortized cost basis by origination, four years before current fiscal year	4,981		4,981		1,260
Term loans amortized cost basis by origination, prior	5,327		5,327		592
Amortized Cost Basis	457		457		240
Total	23,595		23,595		11,356
Gross charge-offs
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			0		17
Prior			1		1
Amortized Cost Basis			0		0
Total			1		18
Total commercial real estate \| Investment properties
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	2,542		2,542		2,354
Term loans amortized cost basis by origination, before current fiscal year	4,662		4,662		1,069
Term loans amortized cost basis by origination, two years before current fiscal year	2,193		2,193		1,001
Term loans amortized cost basis by origination, three years before current fiscal year	1,350		1,350		3,314
Term loans amortized cost basis by origination, four years before current fiscal year	4,720		4,720		1,124
Term loans amortized cost basis by origination, prior	4,964		4,964		459
Amortized Cost Basis	316		316		175
Total	20,747		20,747		9,496
Gross charge-offs
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			0		17
Prior			0		1
Amortized Cost Basis			0		0
Total			0		18
Total commercial real estate \| Investment properties \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	2,542		2,542		2,289
Term loans amortized cost basis by origination, before current fiscal year	4,625		4,625		1,064
Term loans amortized cost basis by origination, two years before current fiscal year	2,188		2,188		995
Term loans amortized cost basis by origination, three years before current fiscal year	1,284		1,284		3,314
Term loans amortized cost basis by origination, four years before current fiscal year	4,611		4,611		1,100
Term loans amortized cost basis by origination, prior	4,720		4,720		447
Amortized Cost Basis	316		316		175
Total	20,286		20,286		9,384
Total commercial real estate \| Investment properties \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0		31
Term loans amortized cost basis by origination, before current fiscal year	0		0		5
Term loans amortized cost basis by origination, two years before current fiscal year	5		5		2
Term loans amortized cost basis by origination, three years before current fiscal year	58		58		0
Term loans amortized cost basis by origination, four years before current fiscal year	59		59		14
Term loans amortized cost basis by origination, prior	144		144		12
Amortized Cost Basis	0		0		0
Total	266		266		64
Total commercial real estate \| Investment properties \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0		34
Term loans amortized cost basis by origination, before current fiscal year	37		37		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0		4
Term loans amortized cost basis by origination, three years before current fiscal year	8		8		0
Term loans amortized cost basis by origination, four years before current fiscal year	50		50		10
Term loans amortized cost basis by origination, prior	100		100		0
Amortized Cost Basis	0		0		0
Total	195		195		48
Total commercial real estate \| 1-4 family properties
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	529		529		622
Term loans amortized cost basis by origination, before current fiscal year	550		550		171
Term loans amortized cost basis by origination, two years before current fiscal year	169		169		99
Term loans amortized cost basis by origination, three years before current fiscal year	128		128		143
Term loans amortized cost basis by origination, four years before current fiscal year	199		199		106
Term loans amortized cost basis by origination, prior	276		276		118
Amortized Cost Basis	66		66		25
Total	1,917		1,917		1,284
Gross charge-offs
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			0		0
Prior			1		0
Amortized Cost Basis			0		0
Total			1		0
Total commercial real estate \| 1-4 family properties \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	527		527		615
Term loans amortized cost basis by origination, before current fiscal year	544		544		167
Term loans amortized cost basis by origination, two years before current fiscal year	165		165		99
Term loans amortized cost basis by origination, three years before current fiscal year	127		127		140
Term loans amortized cost basis by origination, four years before current fiscal year	195		195		106
Term loans amortized cost basis by origination, prior	274		274		117
Amortized Cost Basis	66		66		25
Total	1,898		1,898		1,269
Total commercial real estate \| 1-4 family properties \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	2		2		7
Term loans amortized cost basis by origination, before current fiscal year	6		6		4
Term loans amortized cost basis by origination, two years before current fiscal year	3		3		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0		3
Term loans amortized cost basis by origination, four years before current fiscal year	3		3		0
Term loans amortized cost basis by origination, prior	0		0		0
Amortized Cost Basis	0		0		0
Total	14		14		14
Total commercial real estate \| 1-4 family properties \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0		0
Term loans amortized cost basis by origination, two years before current fiscal year	1		1		0
Term loans amortized cost basis by origination, three years before current fiscal year	1		1		0
Term loans amortized cost basis by origination, four years before current fiscal year	1		1		0
Term loans amortized cost basis by origination, prior	2		2		1
Amortized Cost Basis	0		0		0
Total	5		5		1
Total commercial real estate \| Land and development
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	230		230		294
Term loans amortized cost basis by origination, before current fiscal year	311		311		123
Term loans amortized cost basis by origination, two years before current fiscal year	124		124		33
Term loans amortized cost basis by origination, three years before current fiscal year	42		42		41
Term loans amortized cost basis by origination, four years before current fiscal year	62		62		30
Term loans amortized cost basis by origination, prior	87		87		15
Amortized Cost Basis	75		75		40
Total	931		931		576
Gross charge-offs
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			0		0
Prior			0		0
Amortized Cost Basis			0		0
Total			0		0
Total commercial real estate \| Land and development \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	230		230		294
Term loans amortized cost basis by origination, before current fiscal year	311		311		123
Term loans amortized cost basis by origination, two years before current fiscal year	124		124		33
Term loans amortized cost basis by origination, three years before current fiscal year	40		40		41
Term loans amortized cost basis by origination, four years before current fiscal year	62		62		30
Term loans amortized cost basis by origination, prior	87		87		15
Amortized Cost Basis	75		75		40
Total	929		929		576
Total commercial real estate \| Land and development \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0
Term loans amortized cost basis by origination, three years before current fiscal year	1		1
Term loans amortized cost basis by origination, four years before current fiscal year	0		0
Term loans amortized cost basis by origination, prior	0		0
Amortized Cost Basis	0		0
Total	1		1
Total commercial real estate \| Land and development \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0
Term loans amortized cost basis by origination, three years before current fiscal year	1		1
Term loans amortized cost basis by origination, four years before current fiscal year	0		0
Term loans amortized cost basis by origination, prior	0		0
Amortized Cost Basis	0		0
Total	1		1
Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	1,149		1,149		1,097
Term loans amortized cost basis by origination, before current fiscal year	1,517		1,517		200
Term loans amortized cost basis by origination, two years before current fiscal year	589		589		351
Term loans amortized cost basis by origination, three years before current fiscal year	908		908		660
Term loans amortized cost basis by origination, four years before current fiscal year	1,407		1,407		789
Term loans amortized cost basis by origination, prior	4,170		4,170		608
Amortized Cost Basis	3,626		3,626		1,797
Total	13,366		13,366		5,502
Gross charge-offs
Year One			0		0
Year Two			4		0
Year Three			3		1
Year Four			2		0
Year Five			2		4
Prior			7		1
Amortized Cost Basis			8		6
Total			26		12
Total consumer \| Consumer mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	895		895		909
Term loans amortized cost basis by origination, before current fiscal year	1,279		1,279		183
Term loans amortized cost basis by origination, two years before current fiscal year	490		490		336
Term loans amortized cost basis by origination, three years before current fiscal year	818		818		641
Term loans amortized cost basis by origination, four years before current fiscal year	1,119		1,119		763
Term loans amortized cost basis by origination, prior	3,858		3,858		592
Amortized Cost Basis	0		0		32
Total	8,459		8,459		3,456
Gross charge-offs
Year One			0		0
Year Two			0		0
Year Three			0		1
Year Four			0		0
Year Five			0		0
Prior			0		0
Amortized Cost Basis			0		0
Total			0		1
Total consumer \| Consumer mortgages \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	895		895		908
Term loans amortized cost basis by origination, before current fiscal year	1,274		1,274		181
Term loans amortized cost basis by origination, two years before current fiscal year	487		487		331
Term loans amortized cost basis by origination, three years before current fiscal year	809		809		637
Term loans amortized cost basis by origination, four years before current fiscal year	1,110		1,110		762
Term loans amortized cost basis by origination, prior	3,798		3,798		582
Amortized Cost Basis	0		0		32
Total	8,373		8,373		3,433
Total consumer \| Consumer mortgages \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0		1
Term loans amortized cost basis by origination, before current fiscal year	5		5		2
Term loans amortized cost basis by origination, two years before current fiscal year	3		3		5
Term loans amortized cost basis by origination, three years before current fiscal year	9		9		4
Term loans amortized cost basis by origination, four years before current fiscal year	9		9		1
Term loans amortized cost basis by origination, prior	60		60		10
Amortized Cost Basis	0		0		0
Total	86		86		23
Total consumer \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	5		5		1
Term loans amortized cost basis by origination, before current fiscal year	9		9		1
Term loans amortized cost basis by origination, two years before current fiscal year	12		12		1
Term loans amortized cost basis by origination, three years before current fiscal year	30		30		1
Term loans amortized cost basis by origination, four years before current fiscal year	203		203		0
Term loans amortized cost basis by origination, prior	87		87		3
Amortized Cost Basis	2,656		2,656		1,367
Total	3,002		3,002		1,374
Gross charge-offs
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			1		0
Prior			2		0
Amortized Cost Basis			2		1
Total			5		1
Total consumer \| Home equity \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	5		5		1
Term loans amortized cost basis by origination, before current fiscal year	9		9		0
Term loans amortized cost basis by origination, two years before current fiscal year	11		11		0
Term loans amortized cost basis by origination, three years before current fiscal year	28		28		0
Term loans amortized cost basis by origination, four years before current fiscal year	199		199		0
Term loans amortized cost basis by origination, prior	83		83		2
Amortized Cost Basis	2,647		2,647		1,365
Total	2,982		2,982		1,368
Total consumer \| Home equity \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0		1
Term loans amortized cost basis by origination, two years before current fiscal year	1		1		1
Term loans amortized cost basis by origination, three years before current fiscal year	2		2		1
Term loans amortized cost basis by origination, four years before current fiscal year	4		4		0
Term loans amortized cost basis by origination, prior	4		4		1
Amortized Cost Basis	8		8		2
Total	19		19		6
Total consumer \| Home equity \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0
Term loans amortized cost basis by origination, four years before current fiscal year	0		0
Term loans amortized cost basis by origination, prior	0		0
Amortized Cost Basis	1		1
Total	1		1
Total consumer \| Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0		0
Term loans amortized cost basis by origination, four years before current fiscal year	0		0		0
Term loans amortized cost basis by origination, prior	0		0		0
Amortized Cost Basis	236		236		53
Total	236		236		53
Gross charge-offs
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			0		0
Prior			0		0
Amortized Cost Basis			4		2
Total			4		2
Total consumer \| Credit cards \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0		0
Term loans amortized cost basis by origination, four years before current fiscal year	0		0		0
Term loans amortized cost basis by origination, prior	0		0		0
Amortized Cost Basis	234		234		53
Total	234		234		53
Total consumer \| Credit cards \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0
Term loans amortized cost basis by origination, four years before current fiscal year	0		0
Term loans amortized cost basis by origination, prior	0		0
Amortized Cost Basis	1		1
Total	1		1
Total consumer \| Credit cards \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	0		0
Term loans amortized cost basis by origination, before current fiscal year	0		0
Term loans amortized cost basis by origination, two years before current fiscal year	0		0
Term loans amortized cost basis by origination, three years before current fiscal year	0		0
Term loans amortized cost basis by origination, four years before current fiscal year	0		0
Term loans amortized cost basis by origination, prior	0		0
Amortized Cost Basis	1		1
Total	1		1
Total consumer \| Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loans amortized cost basis by origination, current fiscal year	249		249		187
Term loans amortized cost basis by origination, before current fiscal year	229		229		16
Term loans amortized cost basis by origination, two years before current fiscal year	87		87		14
Term loans amortized cost basis by origination, three years before current fiscal year	60		60		18
Term loans amortized cost basis by origination, four years before current fiscal year	85		85		26
Term loans amortized cost basis by origination, prior	225		225		13
Amortized Cost Basis	734		734		345
Total	1,669		1,669		619
Gross charge-offs
Year One			0		0

Loans and Allowance for Loan Losses - Schedule of Loan Portfolio Class by Risk Grade and Origination Year (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2026

Jun. 30, 2025

Jun. 30, 2026

Jun. 30, 2025

Dec. 31, 2025

Financing Receivable, Credit Quality Indicator [Line Items]

Term loans amortized cost basis by origination, current fiscal year

$ 11,356