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Acquisitions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 07, 2021
Investment [Line Items] |  |  |  |  |  |
Payment, including deposit, for Huatai Group Interest |  |  | $ 1,184 | $ 1,623 | $ 580 |
Payment, including deposit, for Huatai Group Interest |  |  | 1,184 | 1,623 | $ 580 |
Deposit Assets |  |  | $ 101 | $ 107 |  |
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Asia Pacific and Far East [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
BusinessAcquisitionCostOfAcquiredEntityExpectedCashConsideration |  |  |  |  |  | $ 5,750
Huatai Group [Member] | CHINA |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Ownership Percentage |  |  | 47.00% | 47.00% |  |
Equity method investment, additional 31.8 percentage agreed on |  |  | 31.80% |  |  |
Purchase of incremental ownership interest |  |  | $ 2,200 |  |  |
Deposits Assets |  |  | $ 1,100 |  |  |
Payment to acquire additional ownership interest in equity method investment |  |  |  | $ 500 |  |
Equity method investment, additional 7.1 percent agreed on |  |  | 7.10% |  |  |
Huatai Group [Member] | CHINA | Subsequent Event [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Payment to acquire additional ownership interest in equity method investment | $ 113 |  |  |  |  |
Equity method investment, additional 7.1 percentage obtained |  | 38.70% |  |  |  |
Huatai Group [Member] | CHINA | Direct Ownership [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Ownership Percentage |  |  | 47.30% |  |  |

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