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Fair Value of Financial Instruments (Changes in Unrealized Gains (Losses) Included in OCI) (Details) - Fixed maturity securities [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | $ (1,713) | $ (171) | $ 64
Corporate bonds |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | (1,562) | (183) | 58
Foreign government bonds |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | (7) | (10) | 4
ABS [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | (116) | (9) | 5
Hybrid and redeemable preferred securities |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | (22) | 27 | $ (3)
Mortgage Loans On Real Estate [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | (5) | $ 4 |
State and municipal bonds |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |
Unrealized gains (losses) included in OCI, net | $ (1) |  |

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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