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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
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] |  |
Transfers In to Level 3 | $ 200 | $ 164
Transfers Out of Level 3 | (53) | (25)
Transfers In or Out of Level 3, Net | 147 | 139
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 | 160 | 164
Transfers Out of Level 3 | (29) | (24)
Transfers In or Out of Level 3, Net | 131 | 140
ABS [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) |
Transfers In or Out of Level 3, Net | (5) |
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 Out of Level 3 | (4) |
Transfers In or Out of Level 3, Net | (4) |
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 | (15) |
Transfers In or Out of Level 3, Net | 15 |
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 In or Out of Level 3, Net | 2 |
Trading 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 |  | (1)
Transfers In or Out of Level 3, Net | $ 3 | $ (1)

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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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