Derivatives, Sold Credit Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount, Protection sold	$ 18,726	$ 14,789
Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount, Protection sold	8,765	7,994
Credit default swaps [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount, Protection sold	12,438	8,033
Credit default swaps [Member] | Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount, Protection sold	2,622	1,982
Risk participation swaps [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount, Protection sold	6,288	6,756
Risk participation swaps [Member] | Non-investment grade [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Notional amount, Protection sold	$ 6,143	$ 6,012