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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, 2020 | Dec. 31, 2019
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Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | $ 3,942 | $ 1,387
Collateral Posted by LNC (Held by Counter-Party) | (1,489) | (557)
AA- [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 521 | 441
Collateral Posted by LNC (Held by Counter-Party) | (599) | (167)
A+ [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 2,674 | 555
Collateral Posted by LNC (Held by Counter-Party) | (493) | (339)
A [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 35 | 36
Collateral Posted by LNC (Held by Counter-Party) |  |
A- [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) | 712 | 355
Collateral Posted by LNC (Held by Counter-Party) | (397) | (51)
BBB+ [Member] |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counter-Party (Held by LNC) |  |
Collateral Posted by LNC (Held by Counter-Party) |  |

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