Fair Value Measurements, Fair Value Option (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Option, Quantitative Disclosures [Line Items]
Total trading assets after derivative netting	$ 221,711	$ 227,935
Fair value option election [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Total trading assets after derivative netting	4,421	4,882
Trading assets, aggregate unpaid principal	4,800	5,180
Trading assets, fair value carrying amount less aggregate unpaid principal	(379)	(298)
Other assets	911	828
Other assets, aggregate unpaid principal	929	846
Other assets, fair value carrying amount less aggregate unpaid principal	(18)	(18)
Other liabilities	(317)	(311)
Other liabilities, aggregate unpaid principal	0	0
Fair value option aggregate differences other liabilities	(317)	(311)
Long-term debt, carried at fair value	(9,398)	(7,082)
Long-term debt, aggregate unpaid principal	(10,156)	(7,647)
Long-term debt, fair value carrying amount less aggregate unpaid principal	$ 758	$ 565

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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