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Acquisitions (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Jul. 01, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 19,990 | [1] | $ 19,990 | [1] | $ 19,686 |
Other intangible assets |  | $ 6,594 |  | $ 6,594 |  | $ 6,775 |
Huatai Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  | 85.50% |  | 85.50% |  | 76.50% | 69.60%
Additional 9.0 percent ownership interest obtained in subsidiary |  | 9.00% |  |  |  |  |
Outstanding 1.6 percent additional ownership interest agreed on |  | 1.60% |  | 1.60% |  |  |
Huatai Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 64.20% |
Equity method investing, additional 1.0 percent agreed on |  | 1.00% |  | 1.00% |  |  |
Huatai Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries |  |  |  | $ 236 |  |  |
Deposits previously paid on additional ownership interest obtained |  |  |  | 319 |  |  |
Payment on additional ownership interest obtained, including deposits previously paid |  |  |  | $ 555 |  |  |
Goodwill |  |  |  |  |  |  | $ 3,458
Other intangible assets |  |  |  |  |  |  | $ 1,655
healthy paws |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 300 |  |  |  |  |  |
Goodwill | 256 |  |  |  |  |  |
Other intangible assets | $ 44 |  |  |  |  |  |
[1] | Includes $509 million attributable to noncontrolling interests.

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