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Revenue (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]      
Revenue recognized from performance obligations $ 19 $ 49 $ 15
Contract assets 224 178  
Contract liabilities 313 $ 356  
Contract liability, revenue recognized $ 194