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Acquisitions and Divestitures - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 28, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 79,749 | $ 78,678 |  | $ 38,451
Aetna Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  | $ 6,565 |
Accounts receivable |  |  | 4,094 |
Other current assets |  |  | 3,894 |
Investments (current and long-term) |  |  | 17,984 |
Goodwill |  |  | 47,755 |
Intangible assets |  |  | 22,571 |
Other assets |  |  | 8,249 |
Total assets acquired |  |  | 111,112 |
Health care costs payable |  |  | 5,302 |
Other current liabilities |  |  | 9,940 |
Debt (current and long-term) |  |  | 8,098 |
Deferred income taxes |  |  | 4,608 |
Other long-term liabilities |  |  | 13,078 |
Total liabilities assumed |  |  | 41,026 |
Noncontrolling interests |  |  | 320 |
Total consideration transferred |  |  | $ 69,766 |

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