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Reserve for Unpaid Losses and Loss Adjustment Expenses - Group Benefits Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | $ 42,318 |  |  |
Payments |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 44,610 | $ 42,318 |  |
Group Insurance Policy [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | 8,274 | 8,160 | $ 8,210 |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 282 | 254 | 245 | $ 245
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 8,020 | 7,915 | 7,965 |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Current Year Claims and Claims Adjustment Expense | 5,195 | 5,145 | 4,853 |
Prior year's discount accretion | 194 | 193 | 202 |
Prior accident year development [1] | (561) | (502) | (381) |
Total provision for unpaid losses and loss adjustment expenses | 4,828 | 4,836 | 4,674 |
Payments |  |  |  |
Current incurral year | (2,735) | (2,575) | (2,456) |
Prior incurral years | (2,189) | (2,156) | (2,268) |
Total payments | (4,924) | (4,731) | (4,724) |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 7,924 | 8,020 | 7,915 |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 8,206 | 8,274 | 8,160 |
Group Insurance Policy [Member] | Disability Insurance Policy [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development [1] | 483 | 457 | 325 |
Group Insurance Policy [Member] | Group long-term disability |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 270 |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  |  |  |
Payments |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 6,594 |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 6,864 |  |  |
Group Insurance Policy [Member] | Group life and accident, excluding premium waiver |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 4 |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development [1] | 80 | 36 | 50 |
Payments |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 682 |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 686 |  |  |
Group Insurance Policy [Member] | Group supplemental health |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 5 |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development [1] |  | 9 | 6 |
Payments |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 34 |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 39 |  |  |
Group Insurance Policy [Member] | Other Operating Income (Expense) [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Total provision for unpaid losses and loss adjustment expenses | $ 175 | $ 182 | $ 185 |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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