Quarterly report [Sections 13 or 15(d)]

Outstanding Loans and Leases and Allowance for Credit Losses - Residential Mortgage - Credit Quality Indicators (Details)

Outstanding Loans and Leases and Allowance for Credit Losses - Residential Mortgage - Credit Quality Indicators (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]
Total	$ 1,217,619		$ 1,217,619		$ 1,185,700
Total gross charge-offs	1,740	$ 1,824	3,477	$ 3,557
Small Business Card Loans \| United States
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross charge-offs			285		555
Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross charge-offs	16	$ 14	32	$ 20
Consumer real estate \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	236,316		236,316		236,302
Originated in current fiscal year	12,809		12,809		24,345
Originated in fiscal year before current fiscal year	20,461		20,461		15,450
Originated two years before current fiscal year	14,240		14,240		13,099
Originated three years before current fiscal year	12,933		12,933		37,861
Originated four years before current fiscal year	35,488		35,488		72,863
Prior	140,385		140,385		72,684
Total gross charge-offs			18		24
Gross charge-offs, Originated in current fiscal year			0		0
Gross charge-offs, Originated in fiscal year before current fiscal year			1		4
Gross charge-offs, Originated two years before current fiscal year			5		6
Gross charge-offs, Originated three years before current fiscal year			3		6
Gross charge-offs, Originated four years before current fiscal year			3		2
Gross charge-offs, Prior			6		6
Consumer real estate \| Less than 620 \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,055		3,055		3,076
Originated in current fiscal year	62		62		197
Originated in fiscal year before current fiscal year	144		144		242
Originated two years before current fiscal year	167		167		193
Originated three years before current fiscal year	166		166		533
Originated four years before current fiscal year	366		366		724
Prior	2,150		2,150		1,187
Consumer real estate \| Greater than or equal to 620 and less than 660 \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,328		2,328		2,277
Originated in current fiscal year	61		61		192
Originated in fiscal year before current fiscal year	181		181		150
Originated two years before current fiscal year	147		147		143
Originated three years before current fiscal year	135		135		408
Originated four years before current fiscal year	372		372		540
Prior	1,432		1,432		844
Consumer real estate \| Greater than or equal to 660 and less than 740 \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	24,755		24,755		25,065
Originated in current fiscal year	1,116		1,116		2,488
Originated in fiscal year before current fiscal year	2,314		2,314		1,854
Originated two years before current fiscal year	1,598		1,598		1,507
Originated three years before current fiscal year	1,451		1,451		4,253
Originated four years before current fiscal year	3,908		3,908		6,668
Prior	14,368		14,368		8,295
Consumer real estate \| Greater than or equal to 740 \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	197,526		197,526		196,808
Originated in current fiscal year	11,570		11,570		21,311
Originated in fiscal year before current fiscal year	17,722		17,722		13,006
Originated two years before current fiscal year	12,169		12,169		11,089
Originated three years before current fiscal year	11,045		11,045		32,390
Originated four years before current fiscal year	30,617		30,617		62,041
Prior	114,403		114,403		56,971
Less than or equal to 90 percent \| Consumer real estate \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	224,140		224,140		223,761
Originated in current fiscal year	12,374		12,374		22,998
Originated in fiscal year before current fiscal year	19,225		19,225		14,267
Originated two years before current fiscal year	13,231		13,231		12,431
Originated three years before current fiscal year	12,368		12,368		37,042
Originated four years before current fiscal year	34,806		34,806		69,829
Prior	132,136		132,136		67,194
Greater than 90 percent but less than or equal to 100 percent \| Consumer real estate \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,230		2,230		2,318
Originated in current fiscal year	208		208		737
Originated in fiscal year before current fiscal year	674		674		644
Originated two years before current fiscal year	561		561		375
Originated three years before current fiscal year	314		314		405
Originated four years before current fiscal year	345		345		94
Prior	128		128		63
Greater than 100 percent \| Consumer real estate \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,294		1,294		1,147
Originated in current fiscal year	227		227		453
Originated in fiscal year before current fiscal year	462		462		341
Originated two years before current fiscal year	289		289		126
Originated three years before current fiscal year	115		115		137
Originated four years before current fiscal year	112		112		50
Prior	89		89		40
Fully-insured loans \| Consumer real estate \| Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	8,652		8,652		9,076
Originated in current fiscal year	0		0		157
Originated in fiscal year before current fiscal year	100		100		198
Originated two years before current fiscal year	159		159		167
Originated three years before current fiscal year	136		136		277
Originated four years before current fiscal year	225		225		2,890
Prior	$ 8,032		$ 8,032		$ 5,387