Derivative Instruments - Schedule of Collateral Amounts With Rights to Reclaim or Obligation to Return Cash (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	$ 7,182	$ 5,229
Collateral Posted to Counterparty	(110)	(188)
AA-
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	4,043	2,378
Collateral Posted to Counterparty	(21)	(63)
A+
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	2,460	2,496
Collateral Posted to Counterparty	(89)	(125)
A
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	47	82
Collateral Posted to Counterparty	0	0
A-
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	632	273
Collateral Posted to Counterparty	$ 0	$ 0