Investments (Schedule Of Increase (Decrease) In Payables For Collateral On Investments) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Increase (decrease) in payables for collateral on investments
Collateral payable for derivative investments	$ (2,269)	$ 1,414
Securities pledged under securities lending agreements	58	113
Investments pledged for FHLBI	800	450
Total increase (decrease) in payables for collateral on investments	$ (1,411)	$ 1,977

The net change during the reporting period in the amount of cash that is received related to securities pledged for Federal Home Loan Bank of Indianapolis.

No definition available.

Name:	cik0000726865_IncreaseDecreaseInCashCollateralForSecuritiesPledgedForFhlbi
Namespace Prefix:	cik0000726865_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration