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Master Netting and Similar Agreements - Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Securities Sold under Agreements to Repurchase [Abstract]    
Gross amounts of recognized liabilities $ 1,187 $ 717
Gross amounts offset in the Balance Sheets 0 0
Net amounts of liabilities presented in the Balance Sheets 1,187 717
Offsetting securities purchased under agreements to resell 0 (21)
Securities/ government guaranteed loans collateral (1,187) (696)
Net amount $ 0 $ 0