Loans - By Portfolio Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Loan balances by portfolio segment:
Retained	$ 1,425,236	$ 1,300,990	$ 1,408,905
Held-for-sale	16,029		13,840
Loans at fair value	62,255		70,684
Total	1,503,520		1,493,429
Accrued interest receivables	7,000		7,000
Accrued interest receivables written off	17	28
Consumer, excluding credit card
Loan balances by portfolio segment:
Retained	367,274	372,892	368,741
Held-for-sale	317		334
Loans at fair value	24,069		33,183
Total	391,660		402,258
Credit card
Loan balances by portfolio segment:
Retained	239,123		247,797
Held-for-sale	0		0
Loans at fair value	0		0
Total	239,123		247,797
Wholesale
Loan balances by portfolio segment:
Retained	818,839	$ 704,714	792,367
Held-for-sale	15,712		13,506
Loans at fair value	38,186		37,501
Total	$ 872,737		$ 843,374