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Restructuring and Other Charges - Schedule of Changes in Reserve (Details) - Employee Severance - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     $ 27 $ 14
Severance and other separation costs $ 27 $ 28 45 105
Non-cash adjustments     0 (6)
Cash payments     (48) (88)
Restructuring reserve, ending balance $ 24 $ 25 $ 24 $ 25