Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) payment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Product Information [Line Items]
Assets classified as held for sale	$ 120
Liabilities classified as held for sale	$ 77
Operating Lease, Right-of-Use Asset, Statement of Financial Position	Other assets	Other assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position	Other assets	Other assets
Operating Lease, Liability, Statement of Financial Position	Other liabilities	Other liabilities
Finance Lease, Liability, Statement of Financial Position	Other liabilities	Other liabilities
Maximum net premium ratio at individual cohort level	100.00%
Participating policies as a percentage of the face amount of the insurance in force	1.00%	1.00%
Dividend expenses	$ 41	$ 49	$ 48
Other revenues	$ 649	621	657
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
Annuities
Product Information [Line Items]
Fee income	$ 715	743	848
Other revenues	461	468	497
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
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