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Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan.

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Loans and Allowance for Credit Losses - Loans by Portfolio Class and Internal Credit Quality Rating (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2025	Dec. 31, 2025
Loans by origination year
Total loans	$ 410,300		$ 410,300			$ 391,335
Total outstanding commitments	873,319		873,319			839,785
Modified loans	1,098	$ 1,468	2,027	$ 2,686
Pass
Loans by origination year
Total loans	402,513		402,513			382,915
Total outstanding commitments	862,862		862,862			828,343
Total Criticized
Loans by origination year
Total loans	7,787		7,787			8,420
Total outstanding commitments	10,457		10,457			11,442
Special Mention
Loans by origination year
Total loans	2,058		2,058			1,885
Total outstanding commitments	3,387		3,387			3,094
Classified
Loans by origination year
Total loans	5,729		5,729			6,535
Total outstanding commitments	7,070		7,070			8,348
Loans purchased from GNMA mortgage pools
Loans by origination year
Modified loans	429	685	660	1,213
Commercial \| Commercial
Loans by origination year
Originated in 2026/2025	40,719		40,719			73,397
Originated in 2025/2024	57,129		57,129			25,149
Originated in 2024/2023	17,951		17,951			7,857
Originated in 2023/2022	5,180		5,180			10,355
Originated in 2022	5,653		5,653
Originated prior to 2022	5,928		5,928
Originated prior to 2022						7,041
Revolving	27,095		27,095			24,362
Total loans	159,655		159,655			148,161
Modified loans	131	227	299	347
Commercial \| Commercial \| Pass
Loans by origination year
Originated in 2026/2025	39,772		39,772			72,416
Originated in 2025/2024	56,378		56,378			24,344
Originated in 2024/2023	17,410		17,410			7,532
Originated in 2023/2022	5,084		5,084			10,045
Originated in 2022	5,474		5,474
Originated prior to 2022	5,888		5,888
Originated prior to 2022						6,934
Revolving	26,329		26,329			23,494
Total loans	156,335		156,335			144,765
Commercial \| Commercial \| Total Criticized
Loans by origination year
Originated in 2026/2025	947		947			981
Originated in 2025/2024	751		751			805
Originated in 2024/2023	541		541			325
Originated in 2023/2022	96		96			310
Originated in 2022	179		179
Originated prior to 2022	40		40
Originated prior to 2022						107
Revolving	766		766			868
Total loans	3,320		3,320			3,396
Commercial \| Commercial \| Special Mention
Loans by origination year
Originated in 2026/2025	472		472			219
Originated in 2025/2024	224		224			168
Originated in 2024/2023	188		188			47
Originated in 2023/2022	8		8			23
Originated in 2022	89		89
Originated prior to 2022	2		2
Originated prior to 2022						23
Revolving	398		398			484
Total loans	1,381		1,381			964
Commercial \| Commercial \| Classified
Loans by origination year
Originated in 2026/2025	475		475			762
Originated in 2025/2024	527		527			637
Originated in 2024/2023	353		353			278
Originated in 2023/2022	88		88			287
Originated in 2022	90		90
Originated prior to 2022	38		38
Originated prior to 2022						84
Revolving	368		368			384
Total loans	1,939		1,939			2,432
Commercial \| Commercial real estate
Loans by origination year
Originated in 2026/2025	11,172		11,172			16,590
Originated in 2025/2024	14,817		14,817			6,794
Originated in 2024/2023	5,758		5,758			3,741
Originated in 2023/2022	2,515		2,515			6,066
Originated in 2022	4,478		4,478
Originated prior to 2022	11,352		11,352
Originated prior to 2022						13,643
Revolving	2,249		2,249			2,080
Revolving converted to term	7		7			6
Total loans	52,348		52,348			48,920
Modified loans	324	283	635	453
Commercial \| Commercial real estate \| Pass
Loans by origination year
Originated in 2026/2025	10,513		10,513			15,466
Originated in 2025/2024	14,113		14,113			6,368
Originated in 2024/2023	5,387		5,387			3,232
Originated in 2023/2022	2,245		2,245			5,211
Originated in 2022	3,770		3,770
Originated prior to 2022	10,741		10,741
Originated prior to 2022						12,784
Revolving	2,178		2,178			1,991
Revolving converted to term	6		6			5
Total loans	48,953		48,953			45,057
Commercial \| Commercial real estate \| Total Criticized
Loans by origination year
Originated in 2026/2025	659		659			1,124
Originated in 2025/2024	704		704			426
Originated in 2024/2023	371		371			509
Originated in 2023/2022	270		270			855
Originated in 2022	708		708
Originated prior to 2022	611		611
Originated prior to 2022						859
Revolving	71		71			89
Revolving converted to term	1		1			1
Total loans	3,395		3,395			3,863
Commercial \| Commercial real estate \| Special Mention
Loans by origination year
Originated in 2026/2025	73		73			143
Originated in 2025/2024	114		114			88
Originated in 2024/2023	85		85			65
Originated in 2023/2022	51		51			242
Originated in 2022	81		81
Originated prior to 2022	203		203
Originated prior to 2022						301
Revolving	70		70			82
Revolving converted to term	0		0			0
Total loans	677		677			921
Commercial \| Commercial real estate \| Classified
Loans by origination year
Originated in 2026/2025	586		586			981
Originated in 2025/2024	590		590			338
Originated in 2024/2023	286		286			444
Originated in 2023/2022	219		219			613
Originated in 2022	627		627
Originated prior to 2022	408		408
Originated prior to 2022						558
Revolving	1		1			7
Revolving converted to term	1		1			1
Total loans	2,718		2,718			2,942
Consumer \| Residential mortgages
Loans by origination year
Originated in 2026/2025	9,267		9,267			11,918
Originated in 2025/2024	9,838		9,838			7,263
Originated in 2024/2023	5,804		5,804			7,793
Originated in 2023/2022	7,060		7,060			24,681
Originated in 2022	23,872		23,872
Originated prior to 2022	61,470		61,470
Originated prior to 2022						64,230
Total loans	117,311		117,311			115,885
Modified loans	36	92	79	315
Consumer \| Residential mortgages \| Pass
Loans by origination year
Originated in 2026/2025	9,267		9,267			11,917
Originated in 2025/2024	9,836		9,836			7,249
Originated in 2024/2023	5,790		5,790			7,758
Originated in 2023/2022	7,028		7,028			24,620
Originated in 2022	23,803		23,803
Originated prior to 2022	61,170		61,170
Originated prior to 2022						63,891
Total loans	116,894		116,894			115,435
Consumer \| Residential mortgages \| Total Criticized
Loans by origination year
Originated in 2026/2025	0		0			1
Originated in 2025/2024	2		2			14
Originated in 2024/2023	14		14			35
Originated in 2023/2022	32		32			61
Originated in 2022	69		69
Originated prior to 2022	300		300
Originated prior to 2022						339
Total loans	417		417			450
Consumer \| Residential mortgages \| Special Mention
Loans by origination year
Originated in 2026/2025	0		0			0
Originated in 2025/2024	0		0			0
Originated in 2024/2023	0		0			0
Originated in 2023/2022	0		0			0
Originated in 2022	0		0
Originated prior to 2022	0		0
Originated prior to 2022						0
Total loans	0		0			0
Consumer \| Residential mortgages \| Classified
Loans by origination year
Originated in 2026/2025	0		0			1
Originated in 2025/2024	2		2			14
Originated in 2024/2023	14		14			35
Originated in 2023/2022	32		32			61
Originated in 2022	69		69
Originated prior to 2022	300		300
Originated prior to 2022						339
Total loans	417		417			450
Consumer \| Residential mortgages \| Loans purchased from GNMA mortgage pools \| Pass
Loans by origination year
Loans 90 days or more past due	3,900		3,900			3,500
Modified loans			976		$ 1,300
Consumer \| Credit card
Loans by origination year
Total loans	39,079		39,079			38,031
Modified loans	152	147	304	292
Consumer \| Credit card \| Pass
Loans by origination year
Total loans	38,638		38,638			37,548
Consumer \| Credit card \| Total Criticized
Loans by origination year
Total loans	441		441			483
Consumer \| Credit card \| Special Mention
Loans by origination year
Total loans	0		0			0
Consumer \| Credit card \| Classified
Loans by origination year
Total loans	441		441			483
Consumer \| Other retail
Loans by origination year
Originated in 2026/2025	4,354		4,354			6,294
Originated in 2025/2024	5,471		5,471			5,085
Originated in 2024/2023	4,412		4,412			2,731
Originated in 2023/2022	2,234		2,234			2,582
Originated in 2022	2,044		2,044
Originated prior to 2022	6,589		6,589
Originated prior to 2022						7,901
Revolving	15,912		15,912			14,903
Revolving converted to term	891		891			842
Total loans	41,907		41,907			40,338
Modified loans	26	$ 34	50	$ 66
Consumer \| Other retail \| Pass
Loans by origination year
Originated in 2026/2025	4,353		4,353			6,290
Originated in 2025/2024	5,466		5,466			5,075
Originated in 2024/2023	4,401		4,401			2,720
Originated in 2023/2022	2,224		2,224			2,571
Originated in 2022	2,035		2,035
Originated prior to 2022	6,567		6,567
Originated prior to 2022						7,875
Revolving	15,794		15,794			14,780
Revolving converted to term	853		853			799
Total loans	41,693		41,693			40,110
Consumer \| Other retail \| Total Criticized
Loans by origination year
Originated in 2026/2025	1		1			4
Originated in 2025/2024	5		5			10
Originated in 2024/2023	11		11			11
Originated in 2023/2022	10		10			11
Originated in 2022	9		9
Originated prior to 2022	22		22
Originated prior to 2022						26
Revolving	118		118			123
Revolving converted to term	38		38			43
Total loans	214		214			228
Consumer \| Other retail \| Special Mention
Loans by origination year
Originated in 2026/2025	0		0			0
Originated in 2025/2024	0		0			0
Originated in 2024/2023	0		0			0
Originated in 2023/2022	0		0			0
Originated in 2022	0		0
Originated prior to 2022	0		0
Originated prior to 2022						0
Revolving	0		0			0
Revolving converted to term	0		0			0
Total loans	0		0			0
Consumer \| Other retail \| Classified
Loans by origination year
Originated in 2026/2025	1		1			4
Originated in 2025/2024	5		5			10
Originated in 2024/2023	11		11			11
Originated in 2023/2022	10		10			11
Originated in 2022	9		9
Originated prior to 2022	22		22
Originated prior to 2022						26
Revolving	118		118			123
Revolving converted to term	38		38			43
Total loans	$ 214		$ 214			$ 228