Impairments and Other Charges (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Impairments and Other Charges [Abstract]
Impairments and other charges	[1]	$ 61	$ 265

[1] During the three months ended March 31, 2019, we recorded $61 million of impairments and other charges, primarily relating to an impairment of fixed assets. See Note 2 for further information. During the three months ended March 31, 2018, we recognized a pre-tax charge of $265 million related to a write-down of all of our remaining investment in Venezuela.