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Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) item security loan | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) security loan item
Investments [Line Items] |  |  |
Increase (decrease) in gross AFS securities unrealized losses | $ 2,100 |  |
Impaired financing receivable, change in recorded allowance |  | $ 0 |
Number of partnerships in alternative investment portfolio | item | 260 |  | 258
Alternative investments as a percentage of overall invested assets | 1.00% |  | 1.00%
Net portion of OTTI recognized in OCI, pre-tax |  | $ 15 |
Fair value of collateral received that we are permitted to sell or re-pledge | 25 |  |
Securities that have been re-pledged | 25 |  |
Investment commitments | 1,600 |  |
Investment commitments for limited partnerships | 1,000 |  |
Investment commitments for mortgage loans on real estate | 365 |  |
Investment commitments for private placements | 197 |  |
Federal Home Loan Mortgage Corporation [Member] | Investments [Member] |  |  |
Investments [Line Items] |  |  |
Fair value | $ 1,400 |  | $ 1,300
Concentration risk, percentage | 1.00% |  | 1.00%
Federal National Mortgage Association [Member] | Investments [Member] |  |  |
Investments [Line Items] |  |  |
Fair value | $ 1,100 |  | $ 1,000
Concentration risk, percentage | 1.00% |  | 1.00%
Consumer Non-Cyclical Industry [Member] | Investments [Member] |  |  |
Investments [Line Items] |  |  |
Fair value | $ 16,400 |  | $ 16,300
Concentration risk, percentage | 12.00% |  | 12.00%
Financial Service [Member] | Investments [Member] |  |  |
Investments [Line Items] |  |  |
Fair value | $ 15,700 |  | $ 16,400
Concentration risk, percentage | 12.00% |  | 12.00%
Corporate Bonds [Member] |  |  |
Investments [Line Items] |  |  |
Percentage of fair value rated as investment grade | 96.00% |  | 96.00%
Amortized cost of portfolio rated below investment grade | $ 3,900 |  | $ 3,200
Fair value of portfolio rated below investment grade | $ 3,500 |  | $ 3,300
MBS [Member] |  |  |
Investments [Line Items] |  |  |
Severity of second lien loans | 100.00% |  |
Severity of first lien loans | 30.00% |  |
Commercial [Member] |  |  |
Investments [Line Items] |  |  |
Number of impaired loans | security | 2 |  | 1
Percentage threshold of loan-to-value ratios indicating principal is greater than collateral value | 100.00% |  |
Debt-service coverage ratio threshold | item | 1.0 |  |
Commercial [Member] | Maximum [Member] |  |  |
Investments [Line Items] |  |  |
Impaired financing receivable, principal balance | $ 1 |  | $ 1
Commercial [Member] | Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | California [Member] |  |  |
Investments [Line Items] |  |  |
Concentration risk, percentage | 24.00% |  | 24.00%
Commercial [Member] | Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | Texas [Member] |  |  |
Investments [Line Items] |  |  |
Concentration risk, percentage | 11.00% |  | 11.00%
Residential [Member] |  |  |
Investments [Line Items] |  |  |
Number of loans past due | loan | 44 |  | 38
Number of impaired loans | security | 24 |  | 4
Impaired financing receivable, principal balance | $ 6 |  | $ 1
Residential [Member] | Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | California [Member] |  |  |
Investments [Line Items] |  |  |
Concentration risk, percentage | 34.00% |  | 34.00%
Residential [Member] | Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | Florida [Member] |  |  |
Investments [Line Items] |  |  |
Concentration risk, percentage | 18.00% |  | 20.00%

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- Definition Number of partnerships represented in alternative investment portfolio. + References No definition available. + Details
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- Definition This item represents the loss severity as a percentage of first lien loans that was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References No definition available. + Details
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- Definition This item represents the loss severity as a percentage of defaulted second lien loans that was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References No definition available. + Details
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