Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	$ 1,124	$ 997
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	47	44
Debt Securities, Trading, Restricted	14	14
Restricted Cash and Cash Equivalents	3	4
Total restricted assets	1,987	1,279
Collateral Pledged
Loss Contingencies [Line Items]
Securities pledged, Gross Unrealized Capital Losses	799	220
Securities pledged
Loss Contingencies [Line Items]
Fair value of loaned securities	739	143
Fair value of securities delivered as collateral	$ 60	$ 77

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 restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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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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