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Investments (Narrative) (Details) $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) security loan item | Dec. 31, 2021 USD ($) loan security item | Dec. 31, 2020 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
Investments [Line Items] |  |  |  |  |  |  |  |  |
Increase (decrease) in gross AFS securities unrealized losses | $ (12,600) |  |  |  |  |  |  |  |
Trading Securities Change In Gross Gain Loss | $ (632) | $ (51) | $ 118 |  |  |  |  |  |
Mortgage Loans in Process of Foreclosure, Amount |  | $ 15 |  |  |  |  |  |  |
Number of partnerships in alternative investment portfolio | item | 337 | 311 |  |  |  |  |  |  |
Alternative investments as a percentage of overall invested assets |  | 2.00% |  |  |  |  |  |  |
Amortized cost | $ 111,707 | $ 105,142 |  | $ 111,058 | $ 109,592 | $ 107,587 | $ 107,459 | $ 106,668 | $ 105,866
Fair Value | 99,736 | $ 118,711 |  | $ 97,572 | $ 103,317 | $ 110,663 | $ 122,085 | $ 122,215 | $ 117,313
Fair value of collateral received that we are permitted to sell or re-pledge | 25 |  |  |  |  |  |  |  |
Investment commitments | 2,400 |  |  |  |  |  |  |  |
Investment commitments for limited partnerships | 1,900 |  |  |  |  |  |  |  |
Investment commitments for mortgage loans on real estate | 226 |  |  |  |  |  |  |  |
Investment commitments for private placements | $ 310,000 |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Fair value of portfolio rated below investment grade | 3,500 | $ 3,800 |  |  |  |  |  |  |
Mortgage Loans [Member] | Federal Home Loan Mortgage Corporation [Member] | Investments [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value | $ 720 | $ 953 |  |  |  |  |  |  |
Concentration risk, percentage | 1.00% | 1.00% |  |  |  |  |  |  |
Mortgage Loans [Member] | Federal National Mortgage Association [Member] | Investments [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value | $ 745 | $ 926 |  |  |  |  |  |  |
Concentration risk, percentage | 1.00% | 1.00% |  |  |  |  |  |  |
Securities Investment [Member] | Consumer Non-Cyclical Industry [Member] | Investments [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value | $ 15,100 | $ 19,600 |  |  |  |  |  |  |
Concentration risk, percentage | 11.00% | 13.00% |  |  |  |  |  |  |
Securities Investment [Member] | Financial Service [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value | $ 16,600 | $ 19,200 |  |  |  |  |  |  |
Securities Investment [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 | 2 | 4 |  |  |  |  |  |  |
Impaired financing receivable, principal balance | $ 1 | $ 1 |  |  |  |  |  |  |
Commercial [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] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | Texas [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  | 9.00% |  |  |  |  |  |  |
Residential [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of loans past due | loan | 73 | 65 |  |  |  |  |  |  |
Number of impaired loans | security | 37 | 50 |  |  |  |  |  |  |
Impaired financing receivable, principal balance | $ 16 | $ 22 |  |  |  |  |  |  |
Number Of Loans In Foreclosure | loan | 49 | 34 |  |  |  |  |  |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 21 |  |  |  |  |  |  |  |
Residential [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | California [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage | 17.00% | 22.00% |  |  |  |  |  |  |
Residential [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | New Jersey [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage | 12.00% |  |  |  |  |  |  |  |
Residential [Member] | Geographic Concentration Risk [Member] | Mortgage Loans On Real Estate [Member] | Florida [Member] |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  | 14.00% |  |  |  |  |  |  |

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