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Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | $ 1,139 | $ 636
Collateral Posted by LNC (Held by Counter-Party) | (461) | (155)
AA- [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 306 | 33
Collateral Posted by LNC (Held by Counter-Party) | (186) | (3)
A+ [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 466 | 296
Collateral Posted by LNC (Held by Counter-Party) | (212) | (96)
A [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 12 | 106
Collateral Posted by LNC (Held by Counter-Party) | (30) | (56)
A- [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 18 | 4
Collateral Posted by LNC (Held by Counter-Party) |  |
BBB+ [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 337 | 197
Collateral Posted by LNC (Held by Counter-Party) | $ (33) |

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