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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | $ 80 | $ 183 | $ (53) | $ (198)
Mortgage Loans [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net |  |  | 3 |
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | 65 | 174 | (57) | (194)
Fixed Maturity AFS Securities [Member] | 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 |  | (1) | (8) | (4)
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Unrealized gains (losses) included in OCI, net | 3 | 6 | (4) | 2
Fixed Maturity AFS Securities [Member] | 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 | $ 12 | $ 4 | $ 13 | $ (2)

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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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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