Basis of Presentation and Other Information Business combination (Details) $ in Billions			2 Months Ended	6 Months Ended
	Jul. 26, 2019 USD ($) attorney state	Apr. 29, 2019 director	Sep. 30, 2019 attorney	Sep. 30, 2019 commission	Apr. 29, 2018 shares
Business combination [Line Items]
Exchange ratio					0.10256
Equivalent shares | shares					9.75
Fully diluted shares, percentage owned					42.00%
Fully diluted shares, percentage owned by public | shares					0.31
Number of directors, board of directors		14
Number of state attorneys | attorney	5		4
Number of state public utility commissions that have approved the merger transaction | commission				18
Number of state public attorneys | commission				19
Number of states trying to block the merger transaction | state	15
Consideration received | $	$ 5.0
Service transition period, network access	7 years
Service transition period	3 years
SoftBank [Member]
Business combination [Line Items]
Fully diluted shares, percentage owned					27.00%
SoftBank [Member]
Business combination [Line Items]
Number of directors nominated by acquiree		4
Deutsche Telekom [Member]
Business combination [Line Items]
Number of directors nominated by acquiree		9