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Acquisitions & Divestitures - (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Acquisitions    
Percentage of business acquired (as a percent) 100.00%  
Restricted cash $ 463 $ 141
2020 Acquisitions    
Acquisitions    
Number of acquisitions | item 7  
Aggregate acquisitions cost $ 723  
Restricted cash $ 323