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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.