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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ (694) | $ 80 | $ (1,074) | $ (53)
Corporate Bonds [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | (658) | 65 | (1,012) | (57)
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) | (8)
ABS [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | (34) | 3 | (62) | (4)
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 | 6 | $ 12 | 11 | 13
Mortgage Loans [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ (5) |  | $ (6) | $ 3

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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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