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Investments (Narrative) (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) loan security item | Dec. 31, 2021 USD ($) loan security item
Investments [Line Items] |  |
Increase (decrease) in gross AFS securities unrealized losses | $ 8,100.0 |
Number of partnerships in alternative investment portfolio | item | 326 | 311
Alternative investments as a percentage of overall invested assets | 2.00% | 2.00%
Amortized cost | $ 109,647.0 | $ 105,177.0
Fair Value | 103,365.0 | $ 118,746.0
Fair value of collateral received that we are permitted to sell or re-pledge | 25.0 |
Investment commitments | 2,700.0 |
Investment commitments for limited partnerships | 1,500.0 |
Investment commitments for mortgage loans on real estate | 384.0 |
Investment commitments for private placements | $ 806.0 |
Corporate Bonds [Member] |  |
Investments [Line Items] |  |
Percentage of fair value rated as investment grade | 96.00% | 96.00%
Amortized cost | $ 88,791.0 | $ 86,373.0
Fair Value | 83,158.0 | 98,120.0
External Credit Rating, Non Investment Grade [Member] | Corporate Bonds [Member] |  |
Investments [Line Items] |  |
Amortized cost | 3,700.0 | 3,700.0
Fair Value | $ 3,500.0 | 3,800.0
Minimum [Member] |  |
Investments [Line Items] |  |
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements | 80.00% |
Maximum [Member] |  |
Investments [Line Items] |  |
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements | 95.00% |
Mortgage Loans [Member] | Federal Home Loan Mortgage Corporation [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Fair value | $ 797.0 | $ 953.0
Concentration risk, percentage | 1.00% | 1.00%
Mortgage Loans [Member] | Federal National Mortgage Association [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Fair value | $ 799.0 | $ 926.0
Concentration risk, percentage | 1.00% | 1.00%
Federal National Mortgage Association [Member] | Consumer Non-Cyclical Industry [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Fair value | $ 16,100.0 | $ 19,600.0
Concentration risk, percentage | 12.00% | 13.00%
Federal National Mortgage Association [Member] | Financial Service [Member] |  |
Investments [Line Items] |  |
Fair value | $ 17.1 | $ 19.2
Federal National Mortgage Association [Member] | Financial Service [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage | 13.00% | 12.00%
Commercial [Member] |  |
Investments [Line Items] |  |
Number of impaired loans | security | 5 | 4
Impaired financing receivable, principal balance | $ 1.0 | $ 1.0
Commercial [Member] | Federal National Mortgage Association [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | California [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage | 27.00% | 26.00%
Commercial [Member] | Federal National Mortgage Association [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | Texas [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage | 9.00% | 9.00%
Residential [Member] |  |
Investments [Line Items] |  |
Number of loans past due | loan | 63 | 65
Number of impaired loans | loan | 32 | 50
Impaired financing receivable, principal balance | $ 10.0 | $ 22.0
Number Of Loans In Foreclosure | loan | 41 | 34
Mortgage Loans in Process of Foreclosure, Amount | $ 17.0 | $ 15.0
Residential [Member] | Federal National Mortgage Association [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | California [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage | 20.00% | 22.00%
Residential [Member] | Federal National Mortgage Association [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | Florida [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage | 11.00% | 14.00%

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