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Commitment and Contingencies - Restructuring Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]        
Restructuring costs     $ 1 $ 4
Restructuring Reserve [Roll Forward]        
Beginning balance     1  
Additional provision $ 1 $ 2 1 $ 4
Reversal and utilization     0  
Ending balance $ 2   $ 2