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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Debt and Held-to-Maturity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Available-for-Sale Debt and Other, Amortized Cost
Due in 1 year or less	$ 1,560
Due after 1 year through 5 years	19,778
Due after 5 years through 10 years	19,476
Due after 10 years	5,549
Other securities	1,260
Total	47,623	$ 39,107
Available-for-Sale Debt and Other, Fair Value
Due in 1 year or less	1,545
Due after 1 year through 5 years	19,007
Due after 5 years through 10 years	17,934
Due after 10 years	4,720
Other securities	1,260
Fair Value	44,466	36,159
Held-to-Maturity, Amortized Cost
Due in 1 year or less	235
Due after 1 year through 5 years	7,381
Due after 5 years through 10 years	10,621
Due after 10 years	167
Other securities	0
Amortized Cost	18,404	11,368
Held-to-Maturity, Fair Value
Due in 1 year or less	236
Due after 1 year through 5 years	7,351
Due after 5 years through 10 years	10,502
Due after 10 years	169
Other securities	0
Fair Value	$ 18,258	$ 11,404

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