Quarterly Data (Unaudited) (Parenthetical) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended	12 Months Ended
		Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Provisional income tax benefit to reflect the impact of the Tax Act		$ 624		$ 607
Provisional basic and diluted per share impact of the Tax Act		$ 1.01
Shares utilized for calculation of basic and diluted earnings per share	[1]		621	621	621

[1] For all periods presented that ended prior to the date of the Distribution, 621 million shares have been utilized for the calculation of basic and diluted earnings per share as no shares of common stock or equity-based awards of the Company were outstanding prior to that date (See Note 2—Summary of Significant Accounting Policies under the heading “Earnings per share” for additional information).