Investments - Repurchase Agreement, Securities Lending, VIEs (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Available-for-sale Securities Including Securities Pledged [Line Items]
Initial collateral required, percent of market value of loaned securities	102.00%
Securities received as collateral	$ 64	$ 91
Payables under securities loan agreements, including collateral held	1,503	865
Securities pledged as collateral
Available-for-sale Securities Including Securities Pledged [Line Items]
Fair value of loaned securities	820	715
Short-term Investments
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities received as collateral	776	650
Cash collateral, included in Payables
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	776	650
U.S. Treasuries
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	115	109
U.S. Government agencies and authorities \| Cash collateral, included in Payables
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	11	0
U.S. corporate public securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	508	447
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	204	185
Payables under securities loan agreements
Available-for-sale Securities Including Securities Pledged [Line Items]
Payables under securities loan agreements, including collateral held	838	741
Collateralized Loan Obligations
Available-for-sale Securities Including Securities Pledged [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 784	$ 738

The fair value of collateral received by the entity associated with securities borrowed that must be returned if the counterparty fulfills its obligations. It appears on the balance sheet as a liability and has a corresponding asset that appears on the balance sheet called Securities Received as Collateral.

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-SubTopic 210
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Fair value of the securities pledged as collateral against securities loaned.

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The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Available-for-sale Securities, Including Securities Pledged [Line Items]

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Securities Loaned, Rate Required of Collateral as a Percent of Market Value of Loans Securities

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