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Loans and Related Allowance for Credit Losses, Credit Quality Indicators for Credit Card Loans (Details) - Total Consumer [Member] - 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, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Total loans	$ 394,816		$ 394,816		$ 386,272
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Loan charge-offs, loans	990	$ 1,005	1,987	$ 2,027
Credit card [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	57,642		57,642		58,821
Revolving loans converted to term loans, finance receivable	752		752		719
Total loans	58,394		58,394		59,540
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving loans, charge-offs			1,429		2,758
Revolving loans converted to term loans, charge-offs			106		205
Loan charge-offs, loans	770	$ 751	1,535	$ 1,519	2,963
Credit card [Member] \| FICO 740 or more [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	23,179		23,179		23,443
Revolving loans converted to term loans, finance receivable	44		44		37
Total loans	23,223		23,223		23,480
Credit card [Member] \| FICO 700 to 739 [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	12,516		12,516		12,713
Revolving loans converted to term loans, finance receivable	101		101		91
Total loans	12,617		12,617		12,804
Credit card [Member] \| FICO 660 to 699 [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	10,992		10,992		11,267
Revolving loans converted to term loans, finance receivable	166		166		155
Total loans	11,158		11,158		11,422
Credit card [Member] \| FICO 620 to 659 [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	5,335		5,335		5,472
Revolving loans converted to term loans, finance receivable	142		142		136
Total loans	5,477		5,477		5,608
Credit card [Member] \| FICO less than 620 [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	5,484		5,484		5,736
Revolving loans converted to term loans, finance receivable	297		297		298
Total loans	5,781		5,781		6,034
Credit card [Member] \| No FICO available [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	136		136		190
Revolving loans converted to term loans, finance receivable	2		2		2
Total loans	138		138		192
Credit card [Member] \| Current-29 days past due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	56,269		56,269		57,322
Revolving loans converted to term loans, finance receivable	656		656		622
Total loans	56,925		56,925		57,944
Credit card [Member] \| 30 to 89 days past due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	649		649		718
Revolving loans converted to term loans, finance receivable	62		62		65
Total loans	711		711		783
Credit card [Member] \| 90 days or more past due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	724		724		781
Revolving loans converted to term loans, finance receivable	34		34		32
Total loans	$ 758		$ 758		$ 813