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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 06, 2024
Dec. 22, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Loss Contingencies [Line Items]          
Operating Lease, Cost     $ 1,400 $ 1,300 $ 1,200
Operating Lease, Payments     $ 1,100 $ 1,000 $ 900
Operating Lease, Weighted Average Remaining Lease Term     8 years 8 months 12 days    
Operating Lease, Weighted Average Discount Rate, Percent     4.00%    
Other Commitment     $ 6,000    
Other Commitments, Description   On December 22, 2023, the Company entered into an agreement to sell its operations in Brazil to a private investor, subject to regulatory approval and other closing conditions. As of December 31, 2023, the Company has entered into agreements to acquire companies in the health care sector, subject to regulatory approval and other customary closing conditions. The total anticipated capital required for these acquisitions, excluding the payoff of acquired indebtedness, is approximately $6 billion.    
Subsequent Event [Member]          
Loss Contingencies [Line Items]          
Subsequent Event, Description The Company completed the disposition on February 6, 2024, and will record a loss of approximately $7 billion in the quarter ending March 31, 2024, the majority of which was due to foreign currency translation losses in accumulated other comprehensive income.        
Expected Loss On Disposition of a Business $ 7,000