Derivative Financial Instruments - Dealer Counterparties and Central Clearing Parties (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Credit Derivatives [Line Items]
Unsecured positions in a net gain with counterparties after collateral postings	$ 692	$ 684
Asset Pledged as Collateral
Credit Derivatives [Line Items]
Securities, fair value	71,890	38,012
Dealer and other counterparties:
Credit Derivatives [Line Items]
Cash and other collateral received from counterparties	511	542
Derivatives in a net gain position	586	618
Unsecured positions in a net gain with counterparties after collateral postings	75	76
Cash collateral posted	636	590
Derivatives in a net loss position	809	692
Central counterparties clearing:
Credit Derivatives [Line Items]
Cash and other collateral received from counterparties	0	4
Derivatives in a net gain position	1	12
Cash collateral posted	85	45
Derivatives in a net loss position	19	13
Central counterparties clearing: | Asset Pledged as Collateral
Credit Derivatives [Line Items]
Securities, fair value	$ 933	$ 639