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Deferred Policy Acquisition Costs and Value of Business Acquired - Rollforward (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Deferred Policy Acquisition Cost and Value of Businesses Acquired Rollforward [Line Items]
Present Value of Future Insurance Profits, Net	$ 662	$ 298	$ 321
Present Value of Future Insurance Profits, Amortization Expense	(28)	(26)
Deferred policy acquisition costs ("DAC") and Value of business acquired ("VOBA")	1,275	907
One America
Deferred Policy Acquisition Cost and Value of Businesses Acquired Rollforward [Line Items]
Present Value of Future Insurance Profits, Amortization Expense	(29)
One America
Deferred Policy Acquisition Cost and Value of Businesses Acquired Rollforward [Line Items]
Present Value of Future Insurance Profits, Amortization Expense	(21)
One America
Deferred Policy Acquisition Cost and Value of Businesses Acquired Rollforward [Line Items]
Deferrals of commissions and expenses	390
Deferrals
Deferred Policy Acquisition Cost and Value of Businesses Acquired Rollforward [Line Items]
Deferrals of commissions and expenses	2	3
Retirement
Deferred Policy Acquisition Cost and Value of Businesses Acquired Rollforward [Line Items]
Deferred Policy Acquisition Cost	604	600	$ 589
Deferrals of commissions and expenses	27	57
As of December 31, 2024	(23)	(46)
Retirement \| One America
Deferred Policy Acquisition Cost and Value of Businesses Acquired Rollforward [Line Items]
Deferrals of commissions and expenses	3,458
Other [Domain]
Deferred Policy Acquisition Cost and Value of Businesses Acquired Rollforward [Line Items]
Deferred Policy Acquisition Cost	$ 9	$ 9