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Segment Reporting - Reconciliation from Operating Income to Adjusted Operating Income (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Revenue, Major Customer [Line Items] |  |  |  |  |
Operating income (GAAP measure) |  | $ 4,326 | $ 4,680 | $ 7,903 | $ 8,138
Amortization of intangible assets |  | 582 | 578 | 1,169 | 1,164
Acquisition-related integration costs |  | 40 | 70 | 81 | 139
Acquisition purchase price adjustment outside of measurement period |  | (61) | 0 | (61) | 0
Adjusted operating income (loss) |  | $ 4,887 | $ 5,328 | $ 9,092 | $ 9,441
Health Care Benefits |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Receipt related purchase price adjustment from acquisition | $ (61) |  |  |  |

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