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Revenue - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Contract Balance          
Software license contracts term (in years)     1 year    
Deferred revenue $ 503   $ 503   $ 529
Deferred income recognized as revenue 140 $ 140 340 $ 320  
Operating lease revenue $ 148 $ 145 $ 284 $ 285