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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 | $ 19 | $ 170 | $ 219 | $ 334
Transfers Out of Level 3 | (126) | (679) | (179) | (704)
Transfers In or Out of Level 3, Net | (107) | (509) | 40 | (370)
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 | 1 | 165 | 161 | 329
Transfers Out of Level 3 | (2) | (83) | (31) | (107)
Transfers In or Out of Level 3, Net | (1) | 82 | 130 | 222
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 | 15 | 4
Transfers Out of Level 3 | (1) |  | (6) |
Transfers In or Out of Level 3, Net | 14 | 4 | 9 | 4
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 |
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 |  | 3 |
Transfers Out of Level 3 | (41) |  | (45) |
Transfers In or Out of Level 3, Net | (38) |  | (42) |
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 | (73) | (586) | (88) | (586)
Transfers In or Out of Level 3, Net | (73) | (586) | (58) | (586)
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) |  | (1) |
Transfers In 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 In or Out of Level 3, Net | (5) |  | (5) |
Trading securities [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |  |  |
Transfers In to Level 3 |  | 1 | 3 | 1
Transfers Out of Level 3 | (3) | (10) | $ (3) | (11)
Transfers In or Out of Level 3, Net | $ (3) | $ (9) |  | $ (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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