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Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | $ 1,686 | $ 636
Collateral Posted by LNC (Held by Counter-Party) | (817) | (155)
AA- [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 379 | 33
Collateral Posted by LNC (Held by Counter-Party) | (309) | (3)
A+ [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 760 | 296
Collateral Posted by LNC (Held by Counter-Party) | (421) | (96)
A [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 47 | 106
Collateral Posted by LNC (Held by Counter-Party) |  | (56)
A- [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 26 | 4
Collateral Posted by LNC (Held by Counter-Party) |  |
BBB+ [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 474 | 197
Collateral Posted by LNC (Held by Counter-Party) | $ (87) |

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