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Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) security loan item | Dec. 31, 2020 USD ($) security loan item
Investments [Line Items] |  |
Increase (decrease) in gross AFS securities unrealized losses | $ 605 |
Number of partnerships in alternative investment portfolio | item | 279 | 271
Alternative investments as a percentage of overall invested assets | 1.00% | 1.00%
Amortized cost | $ 105,866 | $ 104,174
Fair Value | 117,313 | 123,044
Fair value of collateral received that we are permitted to sell or re-pledge | 21 |
Investment commitments | 2,000 |
Investment commitments for limited partnerships | 1,100 |
Investment commitments for mortgage loans on real estate | 420 |
Investment commitments for private placements | $ 413 |
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% |
Federal Home Loan Mortgage Corporation [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Fair value | $ 1,200 | 1,200
Federal National Mortgage Association [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Fair value | 1,100 | 1,000
Consumer Non-Cyclical Industry [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Fair value | 19,000 | 20,300
Financial Service [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Fair value | $ 18,500 | $ 19,600
Corporate Bonds [Member] |  |
Investments [Line Items] |  |
Percentage of fair value rated as investment grade | 96.00% | 96.00%
Corporate Bonds [Member] | External Credit Rating, Non Investment Grade [Member] |  |
Investments [Line Items] |  |
Amortized cost | $ 4,000 | $ 4,100
Fair Value | $ 4,100 | $ 4,200
Federal National Mortgage Association [Member] | Federal Home Loan Mortgage Corporation [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage | 1.00% | 1.00%
Federal National Mortgage Association [Member] | Federal National Mortgage Association [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage | 1.00% | 1.00%
Federal National Mortgage Association [Member] | Consumer Non-Cyclical Industry [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage |  | 13.00%
Federal National Mortgage Association [Member] | Financial Service [Member] | Investments [Member] |  |
Investments [Line Items] |  |
Concentration risk, percentage | 12.00% | 13.00%
Commercial [Member] |  |
Investments [Line Items] |  |
Number of impaired loans | security | 9 | 4
Impaired financing receivable, principal balance | $ 3 | $ 1
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 | 25.00% | 24.00%
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 | 10.00% | 10.00%
Residential [Member] |  |
Investments [Line Items] |  |
Number of loans past due | loan | 113 | 147
Number of impaired loans | security | 74 | 76
Impaired financing receivable, principal balance | $ 34 | $ 34
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 | 28.00% | 32.00%
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 | 19.00% | 18.00%

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