Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ 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, 2019		327,000
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				(28,000)
Treasury, balance at beginning of period at Jun. 30, 2019				$ (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, Shares, Share-based Payment Arrangement, after Forfeiture		0		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	65	$ 11		$ 54
Payments for Repurchase of Common Stock	(350)
Treasury shares acquired (in shares)				(7,300)
Dividends	(426)		(426)
Other	1		0			1
Balance at end of period (in shares) at Mar. 31, 2020		327,000
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				(35,000)
Treasury, balance at end of period at Mar. 31, 2020				$ (2,086)
Treasury Stock, Value, Acquired, Cost Method	(350)			$ (350)
Balance at beginning of period (in shares) at Dec. 31, 2019		327,000
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				(35,000)
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)				(38)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0		0
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		327,000
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				(35,000)
Treasury, balance at end of period at Mar. 31, 2020				$ (2,086)
Balance at beginning of period (in shares) at Jun. 30, 2020	327,000	327,000
Balance at beginning of period at Jun. 30, 2020	$ 1,792	$ 2,789	1,170		(104)	3
Treasury, balance at beginning of period (in shares) at Jun. 30, 2020	(34,000)			35,000
Treasury, balance at beginning of period at Jun. 30, 2020	$ (2,066)			$ 2,066
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	497					2
Net Income (Loss) Attributable to Parent	495
Other Comprehensive Income (Loss), Net of Tax	56
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 56				56
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	2,000	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 82	$ 18		$ 64
Payments for Repurchase of Common Stock	(200)	$ 0
Treasury shares acquired (in shares)				(3,700)
Dividends	(432)		(432)
Stockholders' Equity, Other Shares				(1,000)
Other	$ 1					1
Balance at end of period (in shares) at Mar. 31, 2021	327,000	327,000
Balance at end of period at Mar. 31, 2021	$ 1,794	$ 2,807	1,233		(48)	4
Treasury, balance at end of period (in shares) at Mar. 31, 2021	(36,000)			(36,000)
Treasury, balance at end of period at Mar. 31, 2021	$ (2,202)			$ (2,202)
Treasury Stock, Value, Acquired, Cost Method	(200)			$ (200)
Balance at beginning of period (in shares) at Dec. 31, 2020		327,000
Balance at beginning of period at Dec. 31, 2020	1,975	$ 2,778	1,255		(53)	4
Treasury, balance at beginning of period (in shares) at Dec. 31, 2020				33,000
Treasury, balance at beginning of period at Dec. 31, 2020				$ 2,009
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	120					1
Net Income (Loss) Attributable to Parent	119
Other Comprehensive Income (Loss), Net of Tax	5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	5
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	36	$ 29		$ 7
Payments for Repurchase of Common Stock	(200)
Treasury shares acquired (in shares)				(3,700)
Dividends	(143)		(143)
Stockholders' Equity, Other Shares				(1,000)
Other	$ (1)		2			(1)
Balance at end of period (in shares) at Mar. 31, 2021	327,000	327,000
Balance at end of period at Mar. 31, 2021	$ 1,794	$ 2,807	$ 1,233		$ (48)	$ 4
Treasury, balance at end of period (in shares) at Mar. 31, 2021	(36,000)			(36,000)
Treasury, balance at end of period at Mar. 31, 2021	$ (2,202)			$ (2,202)
Treasury Stock, Value, Acquired, Cost Method	$ (200)			$ (200)