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Investments (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) loan item security | Dec. 31, 2020 USD ($) loan security item | Dec. 31, 2019 USD ($)
Investments [Line Items] |  |  |
Increase (decrease) in gross AFS securities unrealized losses | $ (253) |  |
Unrealized gain (loss), trading securities | $ (51) | $ 118 | $ 228
Number of partnerships in alternative investment portfolio | item | 311 | 271 |
Alternative investments as a percentage of overall invested assets | 2.00% | 1.00% |
Amortized cost | $ 105,177 | $ 104,174 |
Fair Value | 118,746 | 123,044 |
Net portion of OTTI recognized in OCI, pre-tax |  |  | $ 15
Fair value of collateral received that we are permitted to sell or re-pledge | 22 |  |
Investment commitments | 3,200 |  |
Investment commitments for limited partnerships | 1,600 |  |
Investment commitments for mortgage loans on real estate | 574 |  |
Investment commitments for private placements | $ 1,000 |  |
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 | $ 953 | $ 1,200 |
Concentration risk, percentage | 1.00% | 1.00% |
Federal National Mortgage Association [Member] | Investments [Member] |  |  |
Investments [Line Items] |  |  |
Fair value | $ 926 | $ 1,000 |
Concentration risk, percentage | 1.00% | 1.00% |
Consumer Non-Cyclical Industry [Member] | Investments [Member] |  |  |
Investments [Line Items] |  |  |
Fair value | $ 19,600 | $ 20,300 |
Concentration risk, percentage | 13.00% | 13.00% |
Financial Service [Member] | Investments [Member] |  |  |
Investments [Line Items] |  |  |
Fair value | $ 19,200 | $ 19,600 |
Concentration risk, percentage | 12.00% | 13.00% |
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 | $ 3,700 | $ 4,100 |
Fair value of portfolio rated below investment grade | $ 3,800 | $ 4,200 |
Commercial [Member] |  |  |
Investments [Line Items] |  |  |
Number of impaired loans | security | 4 |  |
Impaired financing receivable, principal balance | $ 1 |  |
Commercial [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | California [Member] |  |  |
Investments [Line Items] |  |  |
Concentration risk, percentage | 26.00% | 24.00% |
Commercial [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | Texas [Member] |  |  |
Investments [Line Items] |  |  |
Concentration risk, percentage | 9.00% | 10.00% |
Residential [Member] |  |  |
Investments [Line Items] |  |  |
Number of loans past due | loan | 65 | 147 |
Number of impaired loans | 50 | 76 |
Impaired financing receivable, principal balance | $ 22 | $ 34 |
Number Of Loans In Foreclosure | loan | 34 | 75 |
Mortgage Loans in Process of Foreclosure, Amount | $ 15 | $ 27 |
Residential [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | California [Member] |  |  |
Investments [Line Items] |  |  |
Concentration risk, percentage | 22.00% | 32.00% |
Residential [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | Florida [Member] |  |  |
Investments [Line Items] |  |  |
Concentration risk, percentage | 14.00% | 18.00% |

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