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Revenue (Contract Liabilities) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2022
USD ($)
Change In Contract With Customer, Liability [Roll Forward]  
Beginning Balance $ 28
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period 4
Revenue recognized that was included in the balance at the beginning of the period (5)
Ending Balance $ 27