Derivatives, Sold Credit Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Details of Sold and Purchased Credit Derivatives [Abstract]
Credit protection sold - Notional amount	$ 23,746	$ 18,776
Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Credit protection sold - Notional amount	6,949	4,974
Credit default swaps [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Credit protection sold - Notional amount	17,577	12,568
Credit default swaps [Member] \| Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Credit protection sold - Notional amount	2,846	922
Risk participation swaps [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Credit protection sold - Notional amount	6,169	6,208
Risk participation swaps [Member] \| Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Credit protection sold - Notional amount	$ 4,103	$ 4,052