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Fair Value of Financial Instruments (Changes in Unrealized Gains (Losses) Included in OCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ (21) | $ (694) | $ 2 | $ (1,074)
Corporate Bonds [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | (15) | (658) | (2) | (1,012)
Foreign Government Bonds [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net |  | (3) |  | (5)
ABS [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | (7) | (34) | 1 | (62)
Hybrid And Redeemable Preferred Securities [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | (2) | 6 | (2) | 11
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 | 2 | $ (5) | 4 | $ (6)
State And Municipal Bonds [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ 1 |  | $ 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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