Repurchase Agreements And Other Debt (Repurchase Arrangements And Weighted Average Interest Rates Classified By Original Maturities) (Details) $ in Millions	Jun. 30, 2026 USD ($) days	Dec. 31, 2025 USD ($) days
Receivable Under Reverse Repurchase Agreements	$ 18,433	$ 16,615
Repurchase Agreements	$ 89,808	$ 85,286
Weighted Average Interest Rate	3.75%	3.97%
Weighted Average Days to Maturity \| days	12	11
Obligation to Return Securities Borrowed Under Reverse Repurchase Agreements at Fair Value	$ 18,150	$ 16,452
Maturity Overnight [Member]
Repurchase Agreements	31,200	27,500
30 Days or Less [Member]
Repurchase Agreements	$ 74,091	$ 69,997
Weighted Average Interest Rate	3.75%	3.98%
Weighted Average Days to Maturity \| days	9	11
1 to 3 Months
Repurchase Agreements	$ 5,421	$ 2,949
Weighted Average Interest Rate	3.80%	4.01%
Weighted Average Days to Maturity \| days	71	49
US Treasury Securities [Member] \| Maturity Overnight [Member]
Repurchase Agreements	$ 10,300	$ 10,900
US Treasury Securities [Member] \| 2 Days to 1 Month [Member]
Repurchase Agreements	$ 10,296	$ 12,340
Weighted Average Interest Rate	3.70%	3.90%
Weighted Average Days to Maturity \| days	1	2
FICC [Member]
Obligation to Return Securities Borrowed Under Reverse Repurchase Agreements at Fair Value	$ 5,400	$ 5,200
US Government Agencies Debt Securities [Member]
Repurchase Agreements	$ 79,512	$ 72,946
Weighted Average Interest Rate	3.75%	3.98%
Weighted Average Days to Maturity \| days	13	12