Loans and Related Allowance for Credit Losses, Credit Quality Indicators for Credit Card Loans (Details) - Total Consumer [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Total loans	$ 387,147		$ 386,272
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Loan charge-offs, loans	997	$ 1,022
Credit card [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving loans, finance receivable	56,532		58,821
Revolving loans converted to term loans, finance receivable	745		719
Total loans	57,277		59,540
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving loans, charge-offs	712		2,758
Revolving loans converted to term loans, charge-offs	53		205
Loan charge-offs, loans	765	$ 768	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	22,449		23,443
Revolving loans converted to term loans, finance receivable	42		37
Total loans	22,491		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	12,259		12,713
Revolving loans converted to term loans, finance receivable	98		91
Total loans	12,357		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	10,883		11,267
Revolving loans converted to term loans, finance receivable	161		155
Total loans	11,044		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	5,241		5,472
Revolving loans converted to term loans, finance receivable	139		136
Total loans	5,380		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	5,566		5,736
Revolving loans converted to term loans, finance receivable	303		298
Total loans	5,869		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	134		190
Revolving loans converted to term loans, finance receivable	2		2
Total loans	136		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	55,088		57,322
Revolving loans converted to term loans, finance receivable	644		622
Total loans	55,732		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	668		718
Revolving loans converted to term loans, finance receivable	64		65
Total loans	732		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	776		781
Revolving loans converted to term loans, finance receivable	37		32
Total loans	$ 813		$ 813

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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