Income Taxes (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense related to continuing operations	$ 87,000,000	$ 95,000,000
Goodwill impairment, tax benefit	0
Goodwill and asset impairment charges	570,000,000	$ 0
Provisional tax benefit due to re-measurement of deferred taxes			$ (1,324,000,000)
Provisional tax expense for the one-time tax			$ 457,000,000
Unrecognized tax benefits	1,178,000,000
Unrecognized tax benefits that would reduce income tax expense and the effective tax rate	1,018,000,000
Discrete tax benefit for reduction in unrecognized tax benefit	$ 20,000,000