Investments (excluding Consolidated Investment Entities) - Fixed Maturities and Equity Securities, Repurchase Agreements and Securities Lending (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 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	$ 117	$ 146
Payables under securities loan and repurchase agreements, including collateral held	1,608	1,373
Securities pledged as collateral
Available-for-sale Securities, Including Securities Pledged [Line Items]
Securities Pledged under repurchase agreements, carrying value	83	66
Fair value of loaned securities	838	1,159
Short-term Investments
Available-for-sale Securities, Including Securities Pledged [Line Items]
Securities received as collateral	749	1,055
Cash collateral, included in Payables
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	$ 749	$ 1,055
Mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Percent collateralized mortgage backed securities including interest-only strip or principal-only strip	44.40%	43.40%
U.S. Treasuries
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	$ 173	$ 213
U.S. Government agencies and authorities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	12	15
U.S. corporate public securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	415	684
Foreign corporate public securities and foreign governments
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	263	289
Payables under securities loan agreements
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	866	1,201
Equity securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	$ 3	$ 0

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)
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Percent Collateralized Mortgage Backed Securities including Interest-Only Strip or Principal-Only Strip

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Securities Loaned, Initial Collateral Required, Percent of Market Value of Loaned Securities

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Securities Pledged under repurchase agreements, carrying value

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