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Derivative Financial Instruments - Dealer Counterparties and Central Clearing Parties (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Credit Derivatives [Line Items]    
Unsecured positions in a net gain with counterparties after collateral postings $ 1,095 $ 951
Asset Pledged as Collateral    
Credit Derivatives [Line Items]    
Pledged securities 38,187 41,270
Dealer and other counterparties:    
Credit Derivatives [Line Items]    
Cash and other collateral received from counterparties 567 609
Derivatives in a net gain position 584 735
Unsecured positions in a net gain with counterparties after collateral postings 89 126
Cash collateral posted 1,097 960
Derivatives in a net loss position 1,210 1,052
Central counterparties clearing:    
Credit Derivatives [Line Items]    
Derivatives in a net gain position 2 2
Cash collateral posted 13 14
Derivatives in a net loss position 0 8
Central counterparties clearing: | Asset Pledged as Collateral    
Credit Derivatives [Line Items]    
Pledged securities $ 647 $ 1,249