Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment payment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Product Information [Line Items]
Number of operating segments | segment	4
Number of reportable segments | segment	4
Assets classified as held for sale	$ 131
Liabilities classified as held for sale	$ 60
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Maximum net premium ratio at individual cohort level	100.00%
Dividend expenses	$ 41	$ 49	$ 48
Other revenues	$ 900	723	777
Sales Force Intangibles
Product Information [Line Items]
Useful life of intangible assets	25 years
VOCRA
Product Information [Line Items]
Useful life of intangible assets	20 years
VODA
Product Information [Line Items]
Useful life of intangible assets	13 years
Maximum
Product Information [Line Items]
Participating policies as a percentage of the face amount of the insurance in force	1.00%
Annuities
Product Information [Line Items]
Fee income	$ 715	743	848
Other revenues	564	584	628
Group Protection
Product Information [Line Items]
Other revenues	$ 210	$ 203	$ 180
Commercial
Product Information [Line Items]
Number of days past due to qualify as delinquent	60 days
Number of missed payments to qualify as delinquent | payment	2
Period in which loans no longer accrue interest	90 days
Number of missed payments to qualify loans as non-accrual | payment	3
Loan-to-value ratio indicating principal is greater than collateral	100.00%
Commercial | Maximum
Product Information [Line Items]
Debt-service coverage ratio indicating property income not covering debt payments	1.0
Residential
Product Information [Line Items]
Period in which loans no longer accrue interest	90 days