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Segment Reporting - Reconciliation from Operating Income to Adjusted Operating Income (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting [Abstract] |  |  |  |  |  |
Operating income (GAAP measure) |  |  | $ 3,061 | $ 3,249 | $ 10,964 | $ 11,387
Amortization of intangible assets |  |  | 561 | 587 | 1,730 | 1,751
Acquisition-related integration costs |  |  | 20 | 57 | 101 | 196
Goodwill impairment |  |  | 431 | 0 | 431 | 0
Acquisition purchase price adjustment outside of measurement period |  |  | 0 | (271) | (61) | (271)
Adjusted operating income (loss) |  |  | $ 4,073 | $ 3,622 | 13,165 | 13,063
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Proceeds from sale of subsidiary |  |  |  |  | 0 | $ 834
Health Care Benefits |  |  |  |  |  |
Segment Reporting [Abstract] |  |  |  |  |  |
Goodwill impairment |  |  |  |  | $ 0 |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Receipt related purchase price adjustment from acquisition |  | $ 61 |  |  |  |
Health Care Benefits | Discontinued Operations, Disposed of by Sale | Coventry Health Care Workers Compensation business |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Proceeds from sale of subsidiary | $ 850 |  |  |  |  |

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