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Acquisitions and Divestitures - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 28, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 79,552 | $ 79,749 | $ 78,678 |
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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