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Securities Purchased under Agreements to Resale & Securities Borrowed (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Offsetting [Abstract]    
Securities purchased under agreements to resell $ 3,460 $ 1,158
Securities borrowed 568 587
Total securities borrowed or purchased under agreements to resell $ 4,028 $ 1,745