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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | $ 3 | $ 19 | $ 69 | $ 219
Transfers Out of Level 3 | (73) | (126) | (371) | (179)
Transfers Into or Out of Level 3, Net | (70) | (107) | (302) | 40
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 | 3 | 1 | 43 | 161
Transfers Out of Level 3 | (50) | (2) | (83) | (31)
Transfers Into or Out of Level 3, Net | (47) | (1) | (40) | 130
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  | 15 |  | 15
Transfers Out of Level 3 |  | (1) |  | (6)
Transfers Into or Out of Level 3, Net |  | 14 |  | 9
U.S. Government Bonds [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 Into or Out of Level 3, Net |  |  |  | 5
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 |  |  | (12) |
Transfers Into or Out of Level 3, Net |  |  | (12) |
CMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  | 3 |  | 3
Transfers Out of Level 3 | (21) | (41) | (21) | (45)
Transfers Into or Out of Level 3, Net | (21) | (38) | (21) | (42)
CLOs [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  |  |  | 30
Transfers Out of Level 3 | (2) | (73) | (93) | (88)
Transfers Into or Out of Level 3, Net | $ (2) | (73) | (93) | (58)
State And Municipal Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  |  |  | 2
Transfers Out of Level 3 |  | (1) |  | (1)
Transfers Into or Out of Level 3, Net |  | (1) |  | 1
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Out of Level 3 |  | (5) |  | (5)
Transfers Into or Out of Level 3, Net |  | (5) |  | (5)
Equity AFS Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Out of Level 3 |  |  | (162) |
Transfers Into or Out of Level 3, Net |  |  | (162) |
Trading Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  |  |  | 3
Transfers Out of Level 3 |  | (3) |  | $ (3)
Transfers Into or Out of Level 3, Net |  | $ (3) |  |
Equity Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  |  | 26 |
Transfers Into or Out of Level 3, Net |  |  | $ 26 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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