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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020 | Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | $ 37,855 |  |  |  |
Payments |  |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 39,659 | $ 37,855 |  |  |
Group Insurance Policy [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | 8,233 | 8,256 | $ 8,445 |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 245 | 237 | 247 |  | $ 239
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 7,996 | 8,009 | 8,206 |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |  |
Current accident year | 5,021 | 4,511 | 4,385 |  |
Prior year's discount accretion | 201 | 209 | 219 |  |
Prior accident year development [1] | (458) | (445) | (410) |  |
Total provision for unpaid losses and loss adjustment expenses | 4,764 | 4,275 | 4,194 |  |
Payments |  |  |  |  |
Current incurral year | (2,631) | (2,288) | (2,277) |  |
Prior incurral years | (2,164) | (2,000) | (2,114) |  |
Total payments | (4,795) | (4,288) | (4,391) |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 7,965 | 7,996 | 8,009 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 8,210 | 8,233 | 8,256 |  |
Group Insurance Policy [Member] | Group supplemental health |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 5 |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |  |
Prior accident year development [1] | 10 | 15 |  |  |
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 | $ 179 | $ 178 | $ 178 |  |
Group Insurance Policy [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments |  |  |  | $ 1 |

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