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Restructuring Charges (Summary of Liabilities Associated with Restructuring Activities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Reserve [Roll Forward]      
Liability, beginning balance $ 3    
Additions 7 $ 16 $ 11
Distributions (10)    
Liability, ending balance $ 0 $ 3