Investments (Mortgage Loans Allowances Gross charge-offs by Portfolio Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	$ 150	$ 55	$ 150
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	0
Originated Three Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	16
Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	34
Originated Five Or More Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	100
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	122	36	22
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	16
Agricultural Mortgage Loans | Originated Four Years Before Latest Fiscal Year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	29
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	77
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	28	19	120
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	5
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	23
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs, net of recoveries	$ 0	$ 0	$ 8