Revenues - Revenue Remaining Performance Obligation (Details) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 83	$ 180
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	423	423
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 117	$ 117
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months	6 months
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, Amount	$ 130	$ 130
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 52	$ 52
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year	1 year