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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 | $ 11 | $ 117 | $ 80 | $ 336
Transfers Out of Level 3 | (159) | (124) | (530) | (303)
Transfers Into or Out of Level 3, Net | (148) | (7) | (450) | 33
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 | 11 | 116 | 54 | 277
Transfers Out of Level 3 | (42) | (57) | (125) | (88)
Transfers Into or Out of Level 3, Net | (31) | 59 | (71) | 189
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
Transfers Out of Level 3 |  | (15) |  | (21)
Transfers Into or Out of Level 3, Net |  | (15) |  | (6)
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
Transfers Out of Level 3 |  | (14) | (21) | (59)
Transfers Into or Out of Level 3, Net |  | (14) | (21) | (56)
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 | (111) | (28) | (204) | (116)
Transfers Into or Out of Level 3, Net | (111) | (28) | (204) | (86)
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)
Transfers Into 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 Into 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) | (162) | (1)
Transfers Into or Out of Level 3, Net |  | (1) | (162) | (1)
Trading Securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers Into Level 3 |  | 1 |  | 4
Transfers Out of Level 3 | (6) |  | (6) | (3)
Transfers Into or Out of Level 3, Net | $ (6) | $ 1 | (6) | $ 1
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 (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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