Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Loss Contingencies [Line Items]
Pledged Collateral	$ 1,675	$ 1,663
Loss Contingency, Range of Possible Loss, Portion Not Accrued	0
Acquisition of mortgage loans
Loss Contingencies [Line Items]
Amount of purchase commitment	122
Purchase of limited partnerships and private placement investments
Loss Contingencies [Line Items]
Amount of purchase commitment	1,801
Line of Credit \| FABNTrustMember
Loss Contingencies [Line Items]
Non-putable funding agreements issued to FHLB	402	400
Federal Home Loan Bank of Boston \| Line of Credit
Loss Contingencies [Line Items]
Non-putable funding agreements issued to FHLB	$ 1,272	$ 1,172

Fair value of the amount outstanding under the credit facility.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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- Definition

Pledged Collateral

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