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Investments (Mortgage Loans - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ (796)		$ (796)		$ (879)
Financing Receivable, Purchase	$ 943	$ 753	$ 2,700	$ 1,500
Percentage of Mortgage Loans Classified as Performing	98.00%		98.00%		98.00%
Mortgage Loans Exchanged for Real Estate Joint Venture			$ 174
Mortgage Loans Contributed To Real Estate Joint Ventures	$ 60	218	60	218
Financing Receivable, Sale		$ 168		168
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	227		227		$ 249
Commercial Mortgage Loans | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost of Mortgage Loans Delinquent during the period				$ 182
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	127		127		117
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	$ 178		$ 178		$ 199

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Amortized Cost of Mortgage Loans Delinquent during the period

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Mortgage Loans Contributed To Real Estate Joint Venture

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The percentage of all mortgage loans that are classified as performing.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
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Amount of decrease in financing receivable from sale. Excludes net investment in lease.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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