Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Millions		12 Months Ended
	May 06, 2024 USD ($)	Dec. 31, 2024 USD ($) segment payment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Product Information [Line Items]
Number of operating segments | segment		4
Number of reportable segments | segment		4
Gain on disposition of business		$ 582	$ 0	$ 0
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		$ 40	$ 41	49
Other revenues		821	938	765
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Wealth Management Business
Product Information [Line Items]
Proceeds from divestiture of interest in consolidated subsidiaries	$ 723
Gain on disposition of business	$ 544
Transaction expenses		$ 38
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		$ 774	715	743
Other revenues		225	564	584
Group Protection
Product Information [Line Items]
Other revenues		$ 224	$ 210	$ 203
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