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Fair Value of Financial Instruments (Changes in Unrealized Gains (Losses) Included in OCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ (602) | $ (77) | $ (1,676) | $ (131)
Corporate Bonds [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | (519) | (82) | (1,532) | (139)
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 | (2) | (3) | (7) | (11)
ABS [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | (39) | (1) | (101) | (5)
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 | (38) | 6 | (26) | 19
Mortgage Loans [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ (4) | $ 3 | $ (10) | $ 5

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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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