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INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2019
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | $ (180) |  |  |
Balance, end of period | $ (165) |  | (165) |  |  |
Transitional real estate loans |  |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (41) | $ (66) | (63) | $ (22) | [1] |
Cumulative Effect of Adoption of 2016-13 |  |  |  |  |  | $ (2)
(Addition to) release of allowance for credit losses | (18) | 13 | 4 | (29) |  |
Write-offs, net of recoveries | 0 | 0 | 0 | 0 |  |
Balance, end of period | (59) | (53) | (59) | (53) |  |
Commercial mortgage loans |  |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (22) | (42) | (32) | (3) | [1] |
Cumulative Effect of Adoption of 2016-13 |  |  |  |  |  | (8)
(Addition to) release of allowance for credit losses | 5 | 14 | 15 | (17) |  |
Write-offs, net of recoveries | 0 | 0 | 0 | 0 |  |
Balance, end of period | (17) | (28) | (17) | (28) |  |
Middle market loans |  |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (76) | (134) | (85) | (20) | [1] |
Cumulative Effect of Adoption of 2016-13 |  |  |  |  |  | (33)
(Addition to) release of allowance for credit losses | (13) | 59 | (4) | (31) |  |
Write-offs, net of recoveries | 0 | (9) | 0 | 0 |  |
Balance, end of period | (89) | (84) | (89) | (84) |  |
Held-to-maturity securities |  |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (8) | (9) | (10) | 0 | [1] |
Cumulative Effect of Adoption of 2016-13 |  |  |  |  |  | (10)
(Addition to) release of allowance for credit losses | (1) | 0 | 1 | 1 |  |
Write-offs, net of recoveries | 0 | 0 | 0 | 0 |  |
Balance, end of period | (9) | (9) | (9) | (9) |  |
Available-for-sale securities |  |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (26) | (38) | (38) | 0 | [1] |
Cumulative Effect of Adoption of 2016-13 |  |  |  |  |  | 0
(Addition to) release of allowance for credit losses | 0 | (1) | 26 | (75) |  |
Write-offs, net of recoveries | 26 | 1 | 12 | 37 |  |
Balance, end of period | 0 | (38) | 0 | (38) |  |
Reinsurance recoverables |  |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (13) | (11) | (12) | 0 | [1] |
Cumulative Effect of Adoption of 2016-13 |  |  |  |  |  | $ (11)
(Addition to) release of allowance for credit losses | 0 | 0 | (1) | 0 |  |
Write-offs, net of recoveries | 0 | 0 | 0 | 0 |  |
Balance, end of period | $ (13) | $ (11) | $ (13) | $ (11) |  |
[1] | U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only.

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- Definition Amount of increase (decrease) of allowance reserve for credit loss. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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