Derivative Instruments - Schedule of Collateral Amounts With Rights to Reclaim or Obligation to Return Cash (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	$ 6,352	$ 7,784
Collateral Posted to Counterparty	(311)	(19)
AA-
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	2,072	2,868
Collateral Posted to Counterparty	(129)	(4)
A+
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	3,836	4,612
Collateral Posted to Counterparty	(182)	(15)
A
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	43	64
Collateral Posted to Counterparty	0	0
A-
Credit Derivatives [Line Items]
Collateral Posted by Counterparty	401	240
Collateral Posted to Counterparty	$ 0	$ 0

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.