SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stable Value Product Account Balances (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Summarized financial information for the company's segments
Stable value product account balances marketed through structured programs	$ 6,573	$ 4,032
Future maturities of stable value products
2022	2,559
2023 - 2024	3,551
2025 - 2026	1,347
Thereafter	$ 1,069
Minimum
Summarized financial information for the company's segments
Maturities of GICs and funding agreements	1 year
Maximum
Summarized financial information for the company's segments
Maturities of GICs and funding agreements	12 years

Represents the maturity period of the guaranteed investment contracts and funding agreements written by the entity.

No definition available.

Name:	plico_GuaranteedInvestmentContractsAndFundingAgreementsMaturityPeriod
Namespace Prefix:	plico_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the liability as of the balance sheet date of amounts related to stable value contracts marketed through structured programs.

+ References

No definition available.

+ Details

Name:	plico_StableValueProductAccountBalancesMarketedThroughStructuredPrograms
Namespace Prefix:	plico_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount of stable value products maturing after year five following the date of the latest balance sheet.

+ References

No definition available.

+ Details

Name:	plico_StableValueProductsMaturingAfterYearFive
Namespace Prefix:	plico_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount of stable value products maturing in year one following the date of the latest balance sheet.

+ References

No definition available.

+ Details

Name:	plico_StableValueProductsMaturingInYearOne
Namespace Prefix:	plico_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount of stable value products maturing in years four and five following the date of the latest balance sheet.

+ References

No definition available.

+ Details

Name:	plico_StableValueProductsMaturingInYearsFourAndFive
Namespace Prefix:	plico_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount of stable value products maturing in years two and three following the date of the latest balance sheet.

+ References

No definition available.

+ Details

Name:	plico_StableValueProductsMaturingInYearsTwoAndThree
Namespace Prefix:	plico_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	plico_StableValueProductsMaturityAbstract
Namespace Prefix:	plico_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: