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Acquisitions Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 07, 2021
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] | Asia Pacific |  |  |  |
Investment Holdings [Line Items] |  |  |  |
BusinessAcquisitionCostOfAcquiredEntityExpectedCashConsideration [Member] |  |  |  | $ 5,720
Huatai Group [Member] | CHINA |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity method investment, additional 31.8 percent 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 | $ 113 |  | $ 500 |
Equity method investment, additional 7.1 percentage agreed on |  | 7.10% |  |
Huatai Group [Member] | CHINA | Direct ownership |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 47.30% |  |  |

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