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Revenue Recognition - Information about Receivables and Deferred Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Trade receivables $ 484 $ 484 $ 404
Deferred revenue (contract liabilities) 108 $ 108 $ 117
Policy period   1 year  
Revenue recognized $ 56 $ 87