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Policyholder Account Balances, Future Policy Benefits and Claims - Balances of and Changes in Liability for Future Policy Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance | $ 9,156 | $ 8,920 |  | $ 10,386
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | 2,027 | 2,512 | $ 2,771 |
Beginning balance at original discount rate | 2,065 | 2,111 | 2,217 |
Effect of changes in cash flow assumptions |  | 0 | 54 | (6)
Effect of actual variances from expected experience |  | (24) | (23) | (40)
Adjusted beginning of year balance |  | 2,041 | 2,142 | 2,171
Issuances | 47 | 111 | 134 |
Interest accrual | 25 | 106 | 111 |
Net premiums collected | (91) | (294) | (305) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 2,022 | 2,065 | 2,111 |
Effect of changes in discount rate assumptions | 1 | (38) | 401 |
Ending balance | 2,023 | 2,027 | 2,512 |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 9,519 | 12,232 | 13,157 |
Beginning balance at original discount rate | 9,706 | 9,769 | 9,920 |
Effect of changes in cash flow assumptions |  | (1) | 35 | (8)
Effect of actual variances from expected experience |  | (29) | (25) | (120)
Adjusted beginning of year balance |  | 9,676 | 9,779 | 9,792
Issuances | 47 | 111 | 135 |
Interest accrual | 122 | 496 | 509 |
Benefit payments | (184) | (680) | (667) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 9,661 | 9,706 | 9,769 |
Effect of changes in discount rate assumptions | 44 | (187) | 2,463 |
Ending balance | 9,705 | 9,519 | 12,232 |
Adjustment due to reserve flooring | 5 | 3 | 1 |
Reserve for future policy benefits | 7,687 | 7,495 | 9,721 |
Less: reinsurance recoverable | 4,135 | 4,060 | 5,291 | 4,248
Net liability for future policy benefits, after reinsurance recoverable | 3,552 | 3,435 | 4,430 | 6,138
Discounted expected future gross premiums | 4,189 | 4,162 | 4,786 |
Expected future gross premiums | 6,336 | 6,422 | 6,115 |
Expected future benefit payments | 16,087 | 16,227 | 16,651 |
Previously Reported |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 8,448
Effect of shadow reserve adjustments |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | (741)
Adjustments for loss contracts (with premiums in excess of gross premiums) under the modified retrospective approach |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 39
Effect of change in deferred profit liability |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | (43)
Effect of remeasurement of the liability at the current single A discount rate |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 2,683
Life Contingent Payout Annuities |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 1,537
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 0 |
Beginning balance at original discount rate | 0 | 0 | 0 |
Effect of changes in cash flow assumptions |  | 0 | 0 | 0
Effect of actual variances from expected experience |  | 0 | 0 | 0
Adjusted beginning of year balance |  | 0 | 0 | 0
Issuances | 31 | 42 | 38 |
Interest accrual | 0 | 0 | 0 |
Net premiums collected | (31) | (42) | (38) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 0 | 0 | 0 |
Effect of changes in discount rate assumptions | 0 | 0 | 0 |
Ending balance | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 1,065 | 1,370 | 1,537 |
Beginning balance at original discount rate | 1,155 | 1,231 | 1,321 |
Effect of changes in cash flow assumptions |  | 0 | 0 | 0
Effect of actual variances from expected experience |  | 0 | (13) | (14)
Adjusted beginning of year balance |  | 1,155 | 1,218 | 1,307
Issuances | 31 | 42 | 39 |
Interest accrual | 12 | 49 | 53 |
Benefit payments | (40) | (154) | (168) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 1,158 | 1,155 | 1,231 |
Effect of changes in discount rate assumptions | (68) | (90) | 139 |
Ending balance | 1,090 | 1,065 | 1,370 |
Adjustment due to reserve flooring | 0 | 0 | 0 |
Reserve for future policy benefits | 1,090 | 1,065 | 1,370 |
Less: reinsurance recoverable | 943 | 949 | 1,265 | 0
Net liability for future policy benefits, after reinsurance recoverable | 147 | 116 | 105 | 1,537
Discounted expected future gross premiums | 0 | 0 | 0 |
Expected future gross premiums | 0 | 0 | 0 |
Expected future benefit payments | $ 1,603 | $ 1,595 | $ 1,707 |
Weighted average interest accretion rate | 4.20% | 4.10% | 4.20% |
Weighted average discount rate | 5.00% | 5.20% | 2.60% |
Weighted average duration of liability (in years) | 6 years | 6 years | 7 years |
Life Contingent Payout Annuities | Previously Reported |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 1,536
Life Contingent Payout Annuities | Effect of shadow reserve adjustments |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | (175)
Life Contingent Payout Annuities | Adjustments for loss contracts (with premiums in excess of gross premiums) under the modified retrospective approach |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 4
Life Contingent Payout Annuities | Effect of change in deferred profit liability |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | (43)
Life Contingent Payout Annuities | Effect of remeasurement of the liability at the current single A discount rate |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 215
Term and Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 898
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | $ 686 | $ 777 | $ 702 |
Beginning balance at original discount rate | 708 | 636 | 536 |
Effect of changes in cash flow assumptions |  | 1 | 1 | 0
Effect of actual variances from expected experience |  | 3 | 47 | 56
Adjusted beginning of year balance |  | 712 | 684 | 592
Issuances | 13 | 57 | 78 |
Interest accrual | 8 | 34 | 29 |
Net premiums collected | (17) | (67) | (63) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 716 | 708 | 636 |
Effect of changes in discount rate assumptions | (5) | (22) | 141 |
Ending balance | 711 | 686 | 777 |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 1,319 | 1,598 | 1,600 |
Beginning balance at original discount rate | 1,313 | 1,255 | 1,169 |
Effect of changes in cash flow assumptions |  | 1 | (8) | 0
Effect of actual variances from expected experience |  | 3 | 52 | 58
Adjusted beginning of year balance |  | 1,317 | 1,299 | 1,227
Issuances | 13 | 57 | 78 |
Interest accrual | 18 | 73 | 70 |
Benefit payments | (37) | (116) | (120) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 1,311 | 1,313 | 1,255 |
Effect of changes in discount rate assumptions | 36 | 6 | 343 |
Ending balance | 1,347 | 1,319 | 1,598 |
Adjustment due to reserve flooring | 5 | 3 | 1 |
Reserve for future policy benefits | 641 | 636 | 822 |
Less: reinsurance recoverable | 447 | 443 | 558 | 601
Net liability for future policy benefits, after reinsurance recoverable | 194 | 193 | 264 | 297
Discounted expected future gross premiums | 1,887 | 1,855 | 2,005 |
Expected future gross premiums | 3,165 | 3,183 | 2,815 |
Expected future benefit payments | $ 2,231 | $ 2,234 | $ 2,159 |
Weighted average interest accretion rate | 6.40% | 6.40% | 6.50% |
Weighted average discount rate | 5.10% | 5.50% | 2.80% |
Weighted average duration of liability (in years) | 7 years | 7 years | 8 years |
Term and Whole Life Insurance | Previously Reported |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 633
Term and Whole Life Insurance | Effect of shadow reserve adjustments |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 0
Term and Whole Life Insurance | Adjustments for loss contracts (with premiums in excess of gross premiums) under the modified retrospective approach |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 0
Term and Whole Life Insurance | Effect of change in deferred profit liability |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 0
Term and Whole Life Insurance | Effect of remeasurement of the liability at the current single A discount rate |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 265
Disability Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 768
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | $ 134 | $ 188 | $ 238 |
Beginning balance at original discount rate | 137 | 155 | 183 |
Effect of changes in cash flow assumptions |  | 0 | 1 | 0
Effect of actual variances from expected experience |  | (6) | (22) | (35)
Adjusted beginning of year balance |  | 131 | 134 | 148
Issuances | 3 | 12 | 18 |
Interest accrual | 2 | 7 | 9 |
Net premiums collected | (4) | (16) | (20) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 132 | 137 | 155 |
Effect of changes in discount rate assumptions | 0 | (3) | 33 |
Ending balance | 132 | 134 | 188 |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 696 | 914 | 1,006 |
Beginning balance at original discount rate | 669 | 688 | 714 |
Effect of changes in cash flow assumptions |  | 0 | 1 | 0
Effect of actual variances from expected experience |  | (9) | (28) | (40)
Adjusted beginning of year balance |  | 660 | 661 | 674
Issuances | 3 | 12 | 18 |
Interest accrual | 9 | 38 | 39 |
Benefit payments | (10) | (42) | (43) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 662 | 669 | 688 |
Effect of changes in discount rate assumptions | 43 | 27 | 226 |
Ending balance | 705 | 696 | 914 |
Adjustment due to reserve flooring | 0 | 0 | 0 |
Reserve for future policy benefits | 573 | 562 | 726 |
Less: reinsurance recoverable | 21 | 19 | 25 | 24
Net liability for future policy benefits, after reinsurance recoverable | 552 | 543 | 701 | 744
Discounted expected future gross premiums | 932 | 926 | 1,158 |
Expected future gross premiums | 1,314 | 1,331 | 1,395 |
Expected future benefit payments | $ 1,153 | $ 1,169 | $ 1,217 |
Weighted average interest accretion rate | 6.20% | 6.10% | 5.90% |
Weighted average discount rate | 5.10% | 5.40% | 2.80% |
Weighted average duration of liability (in years) | 8 years | 8 years | 9 years |
Disability Insurance | Previously Reported |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 530
Disability Insurance | Effect of shadow reserve adjustments |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 0
Disability Insurance | Adjustments for loss contracts (with premiums in excess of gross premiums) under the modified retrospective approach |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 0
Disability Insurance | Effect of change in deferred profit liability |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 0
Disability Insurance | Effect of remeasurement of the liability at the current single A discount rate |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 238
Long Term Care Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 7,183
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |
Beginning balance | $ 1,207 | $ 1,547 | $ 1,831 |
Beginning balance at original discount rate | 1,220 | 1,320 | 1,498 |
Effect of changes in cash flow assumptions |  | (1) | 52 | (6)
Effect of actual variances from expected experience |  | (21) | (48) | (61)
Adjusted beginning of year balance |  | 1,198 | 1,324 | 1,431
Issuances | 0 | 0 | 0 |
Interest accrual | 15 | 65 | 73 |
Net premiums collected | (39) | (169) | (184) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 1,174 | 1,220 | 1,320 |
Effect of changes in discount rate assumptions | 6 | (13) | 227 |
Ending balance | 1,180 | 1,207 | 1,547 |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Beginning balance | 6,439 | 8,350 | 9,014 |
Beginning balance at original discount rate | 6,569 | 6,595 | 6,716 |
Effect of changes in cash flow assumptions |  | (2) | 42 | (8)
Effect of actual variances from expected experience |  | (23) | (36) | (124)
Adjusted beginning of year balance |  | 6,544 | 6,601 | 6,584
Issuances | 0 | 0 | 0 |
Interest accrual | 83 | 336 | 347 |
Benefit payments | (97) | (368) | (336) |
Derecognition (lapses) | 0 | 0 | 0 |
Ending balance at original discount rate | 6,530 | 6,569 | 6,595 |
Effect of changes in discount rate assumptions | 33 | (130) | 1,755 |
Ending balance | 6,563 | 6,439 | 8,350 |
Adjustment due to reserve flooring | 0 | 0 | 0 |
Reserve for future policy benefits | 5,383 | 5,232 | 6,803 |
Less: reinsurance recoverable | 2,724 | 2,649 | 3,443 | 3,623
Net liability for future policy benefits, after reinsurance recoverable | 2,659 | 2,583 | 3,360 | 3,560
Discounted expected future gross premiums | 1,370 | 1,381 | 1,623 |
Expected future gross premiums | 1,857 | 1,908 | 1,905 |
Expected future benefit payments | $ 11,100 | $ 11,229 | $ 11,568 |
Weighted average interest accretion rate | 5.20% | 5.20% | 5.30% |
Weighted average discount rate | 5.10% | 5.40% | 2.90% |
Weighted average duration of liability (in years) | 9 years | 9 years | 10 years |
Long Term Care Insurance | Previously Reported |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Balance |  |  |  | 5,749
Long Term Care Insurance | Effect of shadow reserve adjustments |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | (566)
Long Term Care Insurance | Adjustments for loss contracts (with premiums in excess of gross premiums) under the modified retrospective approach |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 35
Long Term Care Insurance | Effect of change in deferred profit liability |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | 0
Long Term Care Insurance | Effect of remeasurement of the liability at the current single A discount rate |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |
Effect of changes in cash flow assumptions |  |  |  | $ 1,965

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 13I -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117783724-158441 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from increase (decrease) in expected net premium component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 13I -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117783724-158441 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 + Details
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- Definition Amount, after effect of reinsurance, of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 + Details
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