Derivative Financial Instruments - Dealer Counterparties and Central Clearing Parties (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Credit Derivatives [Line Items]
Unsecured positions in a net gain with counterparties after collateral postings	$ 805	$ 684
Asset Pledged as Collateral
Credit Derivatives [Line Items]
Securities, fair value	40,590	38,012
Dealer and other counterparties:
Credit Derivatives [Line Items]
Cash and other collateral received from counterparties	579	542
Derivatives in a net gain position	668	618
Unsecured positions in a net gain with counterparties after collateral postings	89	76
Cash collateral posted	837	590
Derivatives in a net loss position	944	692
Central counterparties clearing:
Credit Derivatives [Line Items]
Cash and other collateral received from counterparties	0	4
Derivatives in a net gain position	10	12
Cash collateral posted	154	45
Derivatives in a net loss position	2	13
Central counterparties clearing: | Asset Pledged as Collateral
Credit Derivatives [Line Items]
Securities, fair value	$ 1,000	$ 639