Asset Impairment and Exit Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs		$ 20
Movement in exit cost liabilities
Liability balance, January 1, 2020	$ 191		$ 140
Charges, net	0
Cash spent	(48)
Currency/other	(3)
Liability balance, March 31, 2020	$ 140
Pakistan [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs		$ 20
Forecast [Member]
Movement in exit cost liabilities
Cash spent			$ (66)