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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]            
Operating Lease, Cost       $ 1,100 $ 1,000 $ 751
Operating Lease, Payments       $ 865 $ 746  
Operating Lease, Weighted Average Remaining Lease Term   8 years 8 months 12 days   8 years 8 months 12 days    
Operating Lease, Weighted Average Discount Rate, Percent   3.00%   3.00%    
Undrawn Letters Of Credit   $ 134   $ 134    
Surety Bonds Outstanding   $ 1,200   $ 1,200    
Other Commitments, Description   In the fourth quarter of 2020, the Company entered into agreements to acquire multiple companies in the health care sector, which are expected to close in the first half of 2021, subject to regulatory approval and other customary closing conditions.        
Subsequent Event [Member]            
Loss Contingencies [Line Items]            
Subsequent Event, Description Additionally, in January 2021, the Company entered into agreements to purchase multiple companies in the health care sector, most notably, Change Healthcare (NASDAQ: CHNG). This acquisition is expected to close in the second half of 2021, subject to Change Healthcare shareholders’ approval, regulatory approvals and other customary closing conditions.          
Payments to be made to Acquire Businesses Net     $ 13,000