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Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |
Transfers Into Level 3 | $ 147 | $ 83
Transfers Out of Level 3 | (182) | (249)
Transfers Into or Out of Level 3, Net | (35) | (166)
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |
Transfers Into Level 3 | 119 | 83
Transfers Out of Level 3 | (77) | (100)
Transfers Into or Out of Level 3, Net | 42 | (17)
RMBS [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |
Transfers Out of Level 3 | (10) | (7)
Transfers Into or Out of Level 3, Net | (10) | (7)
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |
Transfers Into Level 3 | 5 |
Transfers Out of Level 3 | (95) | (105)
Transfers Into or Out of Level 3, Net | (90) | (105)
Trading Securities [Member] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |
Transfers Into Level 3 | 23 |
Transfers Out of Level 3 |  | (37)
Transfers Into or Out of Level 3, Net | $ 23 | $ (37)

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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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