Managed Investment Entities - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) collateralizedloanobligation	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Percentage of investment of most subordinate debt tranche, Minimum	15.00%
Percentage of investment of most subordinate debt tranche, Maximum	100.00%
Number of collateralized loan obligation entities | collateralizedloanobligation	11
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date	$ 57
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date	39
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments	276		$ 146
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt	248		129
Carrying amount of CLO loans in default	26		10
Aggregate unpaid principal balance of variable interest entity loans in default	55		25
Available for sale (AFS) fixed maturities	48,193		46,505
Maximum
Variable Interest Entity [Line Items]
Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities	1	$ 1
Collateralized loan obligations | Managed by third parties
Variable Interest Entity [Line Items]
Available for sale (AFS) fixed maturities	4,607		4,280
Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations	176	$ 179	$ 165
Variable interest entity, primary beneficiary | Subordinated Debt Obligations
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations	$ 89