Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Contingency [Line Items]
Effective income tax rate	14.50%		13.10%	6.90%	19.90%
Tax expense (credit) related to out of period discretes		$ (73)
Brazilian Federal Revenue Service [Member]
Income Tax Contingency [Line Items]
Income tax assessment	$ 77			$ 77
Income tax assessment - Interest and Penalties	228			228
Argentine Tax Authorities [Member]
Income Tax Contingency [Line Items]
Income tax assessment	12			12
Income tax assessment - Interest and Penalties	47			47
Estimated Additional Tax Assessment	37			37
Additional income tax assessment - Interest and Penalties	23			23
Tax and Customs Administration, Netherlands [Member]
Income Tax Contingency [Line Items]
Income tax assessment	91			91
Additional income tax assessment - Interest and Penalties	$ 36			$ 36