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Goodwill and Other Intangibles - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |
Balance, beginning of the period | $ 79,749 | $ 78,678
Segment realignment |  | 0
Purchase accounting adjustments |  | 1,071
Other |  | 0
Acquisitions | 308 |
Divestiture of Workers’ Compensation business | (505) |
Balance, end of the period | 79,552 | 79,749
Pharmacy Services |  |
Goodwill [Roll Forward] |  |
Balance, beginning of the period | 23,581 | 23,388
Segment realignment |  | 194
Purchase accounting adjustments |  | 0
Other |  | (1)
Acquisitions | 34 |
Divestiture of Workers’ Compensation business | 0 |
Balance, end of the period | 23,615 | 23,581
Retail/ LTC |  |
Goodwill [Roll Forward] |  |
Balance, beginning of the period | 10,807 | 10,806
Segment realignment |  | 0
Purchase accounting adjustments |  | 0
Other |  | 1
Acquisitions | 0 |
Divestiture of Workers’ Compensation business | 0 |
Balance, end of the period | 10,807 | 10,807
Health Care Benefits |  |
Goodwill [Roll Forward] |  |
Balance, beginning of the period | 45,361 | 44,484
Segment realignment |  | (194)
Purchase accounting adjustments |  | 1,071
Other |  | 0
Acquisitions | 274 |
Divestiture of Workers’ Compensation business | (505) |
Balance, end of the period | $ 45,130 | $ 45,361

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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