Commitments and Contingencies - Pledged Assets and Funds in Trust (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial Instruments Owned and Pledged as Collateral [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 15,366	$ 9,111
Debt Securities, Trading, Restricted	55	75
Equity Securities, FV-NI, Restricted	38	30
Investment funds	103	174
Derivative assets pledged as collateral	65	96
Short-term investments	120	0
Other Investments Pledged as Collateral	170	130
Restricted Cash and Cash Equivalents	628	796
Total restricted assets	25,394	15,445
Mortgage loans		24,148
Asset Pledged as Collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Mortgage loans	$ 8,849	$ 5,033

Derivative assets pledged as collateral

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- Definition

Investment Funds Pledged as Collateral

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- Definition

Other Investments Pledged as Collateral

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No definition available.

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- Definition

Short Term Investments Pledged as Collateral

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No definition available.

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- Definition

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 restricted investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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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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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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