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Acquisitions (Narrative) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2023 | Jul. 01, 2022 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 19,686 | [1] | $ 19,686 | [1] |  | $ 16,228 | $ 15,213 |
Other intangible assets |  |  |  | 6,775 |  | 6,775 |  |  | 5,441 |  |
Value of business acquired |  |  |  | 3,674 |  | 3,674 |  |  | 3,702 | $ 235 | $ 263
Repurchase agreements |  |  |  | $ 2,833 |  | $ 2,833 |  |  | $ 1,419 |  |
Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent | 69.60% |  |  | 76.50% |  | 76.50% |  |  |  |  |
Additional 7.0 percent ownership interest obtained in subsidiary |  |  |  | 7.00% |  |  |  |  |  |  |
Outstanding 1.9 percent additional ownership interest agreed on |  |  |  |  |  | 0.60% |  |  |  |  |
Huatai Group [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional 7.7 percent ownership interest obtained in subsidiary |  |  | 9.00% |  |  |  |  |  |  |  |
Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  | 64.20% |  |  |
Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 1,189 |  |  |  |  |  |  |  |  |
Other intangible assets |  | 309 |  |  |  |  |  |  |  |  |
Value of business acquired |  | $ 3,633 |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Jul. 01, 2022 |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 5,400 |  |  |  |  |  |  |  |  |
Repurchase agreements |  | $ 2,000 |  |  |  |  |  |  |  |  |
Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | $ 4,100 |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain | 763 |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss | 17 |  |  |  |  |  |  |  |  |  |
Write-off of Accumulated AOCI Loss Balance, Equity Method Invesmtent | 611 |  |  |  |  |  |  |  |  |  |
Business combination, Realized Gain (Loss) from Write-off of AOCI | (628) |  |  |  |  |  |  |  |  |  |
Deposits previously paid on additional ownership interest obtained |  |  |  |  |  | $ 727 |  |  |  |  |
Deposits previously paid on additional ownership interest agreed on |  |  |  |  |  | 12 |  |  |  |  |
Outstanding payment to be made on additional ownership interest agreed on |  |  |  | $ 24 |  | $ 24 |  |  |  |  |
Goodwill | 3,394 |  |  |  |  |  |  |  |  |  |
Other intangible assets | 1,655 |  |  |  |  |  |  |  |  |  |
Value of business acquired | 309 |  |  |  |  |  |  |  |  |  |
Repurchase agreements | $ 1,269 |  |  |  |  |  |  |  |  |  |
Huatai Group [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deposits previously paid on additional ownership interest obtained |  |  | $ 559 |  |  |  |  |  |  |  |
Payments to Acquire Business and Interest in Affiliates, Pending |  |  | 221 |  |  |  |  |  |  |  |
Deposits previously paid on ownership obtained |  |  | 319 |  |  |  |  |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries |  |  | $ 338 |  |  |  |  |  |  |  |
[1] | At December 31, 2023, Goodwill from Huatai Group includes approximately $759 million attributable to noncontrolling interests

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