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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 | $ 117 | $ 150 | $ 336 | $ 484
Transfers Out of Level 3 | (124) | (129) | (303) | (833)
Transfers In or Out of Level 3, Net | (7) | 21 | 33 | (349)
Corporate bonds [Member] | Fixed maturity AFS securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 | 116 | 147 | 277 | 476
Transfers Out of Level 3 | (57) | (81) | (88) | (188)
Transfers In or Out of Level 3, Net | 59 | 66 | 189 | 288
ABS [Member] | Fixed maturity AFS securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 |  |  | 15 | 4
Transfers Out of Level 3 | (15) | (27) | (21) | (27)
Transfers In or Out of Level 3, Net | (15) | (27) | (6) | (23)
U.S. government bonds [Member] | Fixed maturity AFS securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 |  |  | 5 |
Transfers In 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 In to Level 3 |  | 3 |  | 3
Transfers Out of Level 3 |  | (16) |  | (16)
Transfers In or Out of Level 3, Net |  | (13) |  | (13)
CMBS [Member] | Fixed maturity AFS securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 |  |  | 3 |
Transfers Out of Level 3 | (14) |  | (59) |
Transfers In or Out of Level 3, Net | (14) |  | (56) |
CLOs [Member] | Fixed maturity AFS securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 |  |  | 30 |
Transfers Out of Level 3 | (28) | (5) | (116) | (591)
Transfers In or Out of Level 3, Net | (28) | $ (5) | (86) | (591)
State and municipal bonds [Member] | Fixed maturity AFS securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 |  |  | 2 |
Transfers Out of Level 3 |  |  | (1) |
Transfers In or Out of Level 3, Net |  |  | 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 | (9) |  | (14) |
Transfers In or Out of Level 3, Net | (9) |  | (14) |
Equity AFS securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Out of Level 3 | (1) |  | (1) |
Transfers In or Out of Level 3, Net | (1) |  | (1) |
Trading securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 | 1 |  | 4 | 1
Transfers Out of Level 3 |  |  | (3) | (11)
Transfers In or Out of Level 3, Net | $ 1 |  | $ 1 | $ (10)

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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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