Revenue Recognition (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognized that was included in deferred revenue at beginning of period	$ 229
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 797
Revenue, remaining performance obligation, percentage to be recognized	55.00%
Revenue, remaining performance obligation, expected timing of satisfaction	12 months