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Acquisitions (Narrative) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2023 | Jul. 01, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 16,322 |  | $ 16,322 |  | $ 16,228
Other intangible assets |  |  | 5,320 |  | 5,320 |  | 5,441
Repurchase agreements |  |  | 1,518 |  | 1,518 |  | $ 1,419
Cigna integration expenses |  |  | 15 | $ 3 | $ 37 | $ 3 |
Huatai Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity method investment, outstanding 16.6 percent agreed on |  |  |  |  | 16.60% |  |
Equity method investment, outstanding 3.0 percent requiring regulatory approval |  |  |  |  | 3.00% |  |
Equity method investment, deposits previously paid |  |  |  |  | $ 464 |  |
Equity Method Investment, Outstanding payment to be made |  |  | $ 500 |  | $ 500 |  |
Cigna's Life Insurance Business in Asia-Pacific Markets [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Jul. 01, 2022 |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 5,400 |  |  |  |  |
Goodwill |  | 1,177 |  |  |  |  |
Other intangible assets |  | 309 |  |  |  |  |
Repurchase agreements |  | $ 2,000 |  |  |  |  |
Direct ownership | Huatai Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity method investment, additional 7.1 percentage agreed on | 5.40% |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 69.60% |  | 64.20% |  | 64.20% |  |

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