Derivative Instruments - Schedule of Collateral Amounts With Rights to Reclaim or Obligation to Return Cash (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	$ 4,987	$ 7,182
Collateral Posted to Counterparty	(42)	(110)
AA-
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	2,394	4,043
Collateral Posted to Counterparty	(11)	(21)
A+
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	1,978	2,460
Collateral Posted to Counterparty	(31)	(89)
A
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	57	47
Collateral Posted to Counterparty	0	0
A-
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	558	632
Collateral Posted to Counterparty	$ 0	$ 0