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Restructuring and Other Charges - Schedule of Changes in Reserve (Details) - Employee Termination Costs - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance $ 14 $ 0
Severance and other separation costs 131 32
Cash payments (118) (18)
Restructuring reserve, ending balance $ 27 $ 14