Investments (Mortgage Loans Allowances Gross charge-offs by Portfolio Segment) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	$ 151	$ 51
OriginatedInCurrentFiscalYear
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Originated In Fiscal Year Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Originated Two Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	1
Originated Three Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	25
Originated Five Or More Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	125
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	9	0
Agricultural Mortgage Loans \| OriginatedInCurrentFiscalYear
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans \| Originated In Fiscal Year Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans \| Originated Two Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans \| Originated Three Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans \| Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Agricultural Mortgage Loans \| Originated Five Or More Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	9
Residential Mortgage Loans \| OriginatedInCurrentFiscalYear
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Residential Mortgage Loans \| Originated In Fiscal Year Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Residential Mortgage Loans \| Originated Three Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Residential Mortgage Loans \| Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	1
Residential Mortgage Loans \| Originated Five Or More Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	1
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	139	51
Commercial Mortgage Loans \| OriginatedInCurrentFiscalYear
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans \| Originated In Fiscal Year Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans \| Originated Two Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans \| Originated Three Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	0
Commercial Mortgage Loans \| Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	24
Commercial Mortgage Loans \| Originated Five Or More Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	115
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	3	$ 0
Residential Mortgage Loans \| Originated Two Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	$ 1