Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	$ 997	$ 1,124
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	35	47
Debt Securities, Trading, Restricted	11	14
Restricted Cash and Cash Equivalents	2	3
Total restricted assets	1,837	1,987
Federal Home Loan Bank of Boston \| Line of Credit
Loss Contingencies [Line Items]
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	997
Collateral Pledged
Loss Contingencies [Line Items]
Securities pledged, Gross Unrealized Capital Losses	792	799
Securities pledged
Loss Contingencies [Line Items]
Fair value of loaned securities	690	739
Securities Owned and Pledged as Collateral	$ 102	$ 60

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of the securities pledged as collateral against securities loaned.

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