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Acquisitions & Divestitures - (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Acquisitions      
Restricted Cash $ 307 $ 463  
Acquisitions 2021, 2020, and 2019      
Acquisitions      
Percentage of business acquired (as a percent) 100.00% 100.00% 100.00%
2021 Acquisitions      
Acquisitions      
Number of acquisitions | item 15    
Aggregate acquisitions cost $ 3,342