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Revenue Recognition - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Revenue included in contract liability $ 199 $ 223  
Contract liabilities 317 300 $ 338
Revenues $ 6,951 $ 7,313 $ 8,052
Minimum      
Disaggregation of Revenue [Line Items]      
Contract term 1 year    
Maximum      
Disaggregation of Revenue [Line Items]      
Contract term 5 years    
Average | Consumer customers, average contract life      
Disaggregation of Revenue [Line Items]      
Customer life 30 months    
Average | Business customer, average contract life      
Disaggregation of Revenue [Line Items]      
Customer life 29 months