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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 22, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |  |
Operating Lease, Cost |  | $ 1,300 | $ 1,200 | $ 1,100
Operating Lease, Payments |  | $ 996 | $ 921 | $ 865
Operating Lease, Weighted Average Remaining Lease Term |  | 8 years 7 months 6 days |  |
Operating Lease, Weighted Average Discount Rate, Percent |  | 3.40% |  |
Other Commitment |  | $ 9,000 |  |
Other Commitments, Description |  | As of December 31, 2022, the Company has entered into agreements to acquire companies in the health care sector, most notably, LHC Group, Inc. (NASDAQ: LHCG), subject to regulatory approval and other customary closing conditions. |  |
Subsequent Event [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Subsequent Event, Description | The Company completed the acquisition of LHC Group, Inc. on February 22, 2023. |  |  |

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