Investments (Schedule Of Increase (Decrease) In Payables For Collateral On Investments) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Increase (decrease) in payables for collateral on investments
Collateral payable for derivative investments	$ 1,312	$ (2,269)
Securities pledged under securities lending agreements	(8)	58
Investments pledged for FHLBI	(980)	800
Total increase (decrease) in payables for collateral on investments	$ 324	$ (1,411)

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