Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	$ 1,087	$ 771
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	44	40
Debt Securities, Trading, Restricted	14	13
Restricted Cash and Cash Equivalents	5	5
Total restricted assets	1,978	1,711
Securities pledged
Loss Contingencies [Line Items]
Fair value of loaned securities	715	759
Fair value of securities delivered as collateral	$ 113	$ 123

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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-Name Accounting Standards Codification
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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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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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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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