Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)	Noncontrolling Interest
Balance at beginning of period (in shares) at Jun. 30, 2018		327.0
Balance at beginning of period at Jun. 30, 2018	$ 6,059	$ 2,730	$ 4,645		$ (92)	$ 0
Treasury, balance at beginning of period (in shares) at Jun. 30, 2018				(18.0)
Treasury, balance at beginning of period at Jun. 30, 2018				$ (1,224)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,170					1
Net Income (Loss) Attributable to Parent	1,169
Other Comprehensive Income (Loss), Net of Tax	(19)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(19)				(19)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture				1.0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	49	$ 18		$ 31
Payments for Repurchase of Common Stock	(600)			$ (600)
Treasury shares acquired (in shares)				(12.0)
Dividends	(429)		(429)
Other	(2)		1			(1)
Balance at end of period (in shares) at Mar. 31, 2019		327.0
Balance at end of period at Mar. 31, 2019	6,232	$ 2,748	5,386		(111)	2
Treasury, balance at end of period (in shares) at Mar. 31, 2019				(29.0)
Treasury, balance at end of period at Mar. 31, 2019				$ (1,793)
Balance at beginning of period (in shares) at Dec. 31, 2018		327.0
Balance at beginning of period at Dec. 31, 2018	6,043	$ 2,728	5,233		(123)	0
Treasury, balance at beginning of period (in shares) at Dec. 31, 2018				(29.0)
Treasury, balance at beginning of period at Dec. 31, 2018				$ (1,795)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	296					0
Net Income (Loss) Attributable to Parent	296
Other Comprehensive Income (Loss), Net of Tax	12
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	12				12
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	22	$ 20		$ 2
Dividends	(143)		(143)
Other	(2)		0			(2)
Balance at end of period (in shares) at Mar. 31, 2019		327.0
Balance at end of period at Mar. 31, 2019	$ 6,232	$ 2,748	5,386		(111)	2
Treasury, balance at end of period (in shares) at Mar. 31, 2019				(29.0)
Treasury, balance at end of period at Mar. 31, 2019				$ (1,793)
Balance at beginning of period (in shares) at Jun. 30, 2019	327.0	327.0
Balance at beginning of period at Jun. 30, 2019	$ 6,330	$ 2,763	5,434		(79)	2
Treasury, balance at beginning of period (in shares) at Jun. 30, 2019	(28.0)			28.0
Treasury, balance at beginning of period at Jun. 30, 2019	$ (1,790)			$ 1,790
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(4,350)					2
Net Income (Loss) Attributable to Parent	(4,352)
Other Comprehensive Income (Loss), Net of Tax	(62)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(62)				(62)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	65	11		54
Payments for Repurchase of Common Stock	(350)	$ 0		$ (350)
Treasury shares acquired (in shares)				(7.3)
Dividends	(426)		(426)
Other	$ 1		0			1
Balance at end of period (in shares) at Mar. 31, 2020	327.0	327.0
Balance at end of period at Mar. 31, 2020	$ 1,206	$ 2,774	656		(141)	3
Treasury, balance at end of period (in shares) at Mar. 31, 2020	(35.0)			(35.0)
Treasury, balance at end of period at Mar. 31, 2020	$ (2,086)			$ (2,086)
Balance at beginning of period (in shares) at Dec. 31, 2019		327.0
Balance at beginning of period at Dec. 31, 2019	1,002	$ 2,752	449		(103)	3
Treasury, balance at beginning of period (in shares) at Dec. 31, 2019				35.0
Treasury, balance at beginning of period at Dec. 31, 2019				$ 2,099
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	351					1
Net Income (Loss) Attributable to Parent	350
Other Comprehensive Income (Loss), Net of Tax	(38)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(38)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	35	$ 22		$ 13
Dividends	(142)		(142)
Other	$ 2		(1)			(1)
Balance at end of period (in shares) at Mar. 31, 2020	327.0	327.0
Balance at end of period at Mar. 31, 2020	$ 1,206	$ 2,774	$ 656		$ (141)	$ 3
Treasury, balance at end of period (in shares) at Mar. 31, 2020	(35.0)			(35.0)
Treasury, balance at end of period at Mar. 31, 2020	$ (2,086)			$ (2,086)