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Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | $ 694 | $ 636
Collateral Posted by LNC (Held by Counter-Party) | (285) | (155)
AA- [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 56 | 33
Collateral Posted by LNC (Held by Counter-Party) | (3) | (3)
A+ [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 389 | 296
Collateral Posted by LNC (Held by Counter-Party) | (281) | (96)
A [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 5 | 106
Collateral Posted by LNC (Held by Counter-Party) |  | (56)
A- [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 244 | 4
Collateral Posted by LNC (Held by Counter-Party) | (1) |
BBB+ [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) |  | 197
Collateral Posted by LNC (Held by Counter-Party) |  |

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