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Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |
Transfers In to Level 3 | $ 518 | $ 613 | $ 284
Transfers Out of Level 3 | (331) | (997) | (196)
Transfers In or Out of Level 3, Net | 187 | (384) | 88
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 | 458 | 605 | 224
Transfers Out of Level 3 | (88) | (224) | (166)
Transfers In or Out of Level 3, Net | 370 | 381 | 58
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 | 16 | 4 |
Transfers Out of Level 3 | (21) | (28) |
Transfers In or Out of Level 3, Net | (5) | (24) |
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 Out of Level 3 |  | (8) |
Transfers In or Out of Level 3, Net | 5 | (8) |
Foreign 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 |  |  | 4
Transfers Out of Level 3 |  |  | (4)
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 |
Transfers Out of Level 3 | (11) | (67) |
Transfers In or Out of Level 3, Net | (11) | (64) |
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 | (59) | (31) |
Transfers In or Out of Level 3, Net | (56) | (31) |
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 |  | 4
Transfers Out of Level 3 | (131) | (621) | (16)
Transfers In or Out of Level 3, Net | (101) | (621) | (12)
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 In to Level 3 |  |  | 48
Transfers Out of Level 3 | (14) |  | (5)
Transfers In or Out of Level 3, Net | (14) |  | 43
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 | 4 | 1 | 4
Transfers Out of Level 3 | (5) | (18) | $ (4)
Transfers In or Out of Level 3, Net | $ (1) | $ (17) |

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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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