Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Pledged Collateral	$ 1,678	$ 1,881
FHLB restricted stock	71	78
Trading securities	34	46
Cash and cash equivalents	31	31
Total restricted assets	2,937	3,234
Collateral Pledged
Loss Contingencies [Line Items]
Securities pledged	1,123	1,198
Securities pledged as collateral
Loss Contingencies [Line Items]
Fair value of loaned securities	854	969
Securities Pledged under repurchase agreements, carrying value	120	105
Securities Loaned
Loss Contingencies [Line Items]
Securities Owned and Pledged as Collateral	$ 149	$ 124

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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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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

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