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Insurance (Future Policy Benefits Information by Product) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2022 | Jan. 01, 2021 | Dec. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance | $ 32,286 | $ 36,373 |  |  |  |  |
Future policy benefits | 32,286 |  | $ 31,497 | $ 39,990 |  |  |
Term and Whole Life Insurance |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change | 2,895 | 3,216 | 2,871 | 3,325 |  |  | $ 3,448
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance | 3,165 | 3,190 | 3,212 | 3,051 |  |  | 2,994
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements |  |  | 0 | 122 | $ 122 | $ 0 |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0 | (1) | 137 | 70 |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  | (9) | 77 | 119 | 153 |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  | 3,203 | 3,249 | 3,429 | 3,217 |
Liability for Future Policy Benefit, Expected Net Premium, Issuance | 24 | 20 | 93 | 113 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income | 28 | 28 | 116 | 111 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected | (90) | (107) | (426) | (390) |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax | (270) | 26 | (341) | 274 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | 5,359 | 5,996 | 5,279 | 6,426 |  |  | 6,852
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance | 5,860 | 5,910 | 5,922 | 5,820 |  |  | 5,862
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements | 0 | 135 | 135 | 0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0 | 0 | 157 | 70 |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  | (9) | 85 | 155 | 153 |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  | 5,913 | 6,040 | 6,267 | 6,085 |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance | 24 | 22 | 101 | 128 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense | 54 | 56 | 222 | 222 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment | (131) | (208) | (668) | (615) |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax | (501) | 86 | (643) | 606 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 2,464 | 2,780 | 2,408 | 3,101 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance | 43 | 61 | 45 | 64 |  |  |
Future policy benefits | $ 2,421 | $ 2,719 | 2,363 | 3,037 |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration | 8 years 4 months 24 days | 8 years 4 months 24 days |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate | 3.96% | 3.98% |  |  |  |  |
Liability for Future Policy Benefit, Gross Premium Income | $ 153 | $ 171 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 6,618 | 6,954 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 4,905 | 5,138 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 8,099 | 8,195 |  |  |  |  |
Income Annuities |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change | 0 | 0 | 0 | 0 |  |  | 0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance | 0 | 0 | 0 | 0 |  |  | 0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements |  |  | 0 | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0 | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  | 0 | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  | 0 | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Net Premium, Issuance | 0 | 0 | 0 | 0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income | 0 | 0 | 0 | 0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected | 0 | 0 | 0 | 0 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax | 0 | 0 | 0 | 0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | 3,604 | 3,953 | 3,512 | 4,333 |  |  | 4,691
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance | 3,891 | 3,843 | 3,897 | 3,865 |  |  | 3,938
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements | 0 | 0 | 0 | 0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0 | 0 | 56 | (41) |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  | (31) | (9) | (22) | (6) |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  | 3,866 | 3,856 | 3,899 | 3,891 |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance | 78 | 43 | 224 | 198 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense | 36 | 37 | 146 | 150 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment | (89) | (93) | (372) | (374) |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax | (287) | 110 | (385) | 468 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 3,604 | 3,953 | 3,512 | 4,333 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance | 26 | 25 | 24 | 27 |  |  |
Future policy benefits | $ 3,578 | $ 3,928 | 3,488 | 4,306 |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration | 8 years 4 months 24 days | 8 years 6 months |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate | 3.87% | 3.95% |  |  |  |  |
Liability for Future Policy Benefit, Gross Premium Income | $ 102 | $ 45 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 0 | 0 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 0 | 0 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 5,375 | 5,479 |  |  |  |  |
Structured Settlement and Pension Risk Transfer Annuities |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change | 0 | 0 | 0 | 0 |  |  | 0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance | 0 | 0 | 0 | 0 |  |  | 0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements |  |  | 0 | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0 | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  | 0 | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  | 0 | 0 | 0 | 0 |
Liability for Future Policy Benefit, Expected Net Premium, Issuance | 0 | 0 | 0 | 0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income | 0 | 0 | 0 | 0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected | 0 | 0 | 0 | 0 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax | 0 | 0 | 0 | 0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | 6,928 | 8,889 | 6,793 | 10,171 |  |  | 11,301
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance | 7,313 | 8,069 | 7,410 | 8,165 |  |  | $ 8,531
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements | 0 | 0 | (278) | 0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  | 0 | 0 | (157) | (41) |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  | (31) | (22) | (23) | (16) |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  | 7,379 | 8,143 | $ 7,707 | $ 8,474 |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance | 0 | 0 | 0 | 0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense | 80 | 87 | 327 | 359 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment | (146) | (161) | (624) | (668) |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax | (385) | 820 | (617) | 2,006 |  |  |
Liability for Future Policy Benefit, before Reinsurance | 6,928 | 8,889 | 6,793 | 10,171 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance | 69 | 82 | 68 | 93 |  |  |
Future policy benefits | $ 6,859 | $ 8,807 | $ 6,725 | $ 10,078 |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration | 11 years 7 months 6 days | 12 years 8 months 12 days |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate | 4.46% | 4.45% |  |  |  |  |
Liability for Future Policy Benefit, Gross Premium Income | $ 0 | $ 0 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 0 | 0 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 0 | 0 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | $ 14,224 | $ 17,046 |  |  |  |  |

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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 -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + 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 -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption, of expected future benefit and expense component for liability for future policy benefit, discounted at original rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of increase (decrease) in expected future policy benefit and expense component for liability for future policy benefit from change, classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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