Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Contingency [Line Items]
Effective income tax rate	(13.00%)		18.90%	3.40%	19.40%
Tax expense (credit) related to out of period discretes		$ 73
Argentine Tax Authorities [Member]
Income Tax Contingency [Line Items]
Income tax assessment	$ 11			$ 11
Income tax assessment - Interest and Penalties	44			44
Estimated Additional Tax Assessment	34			34
Additional income tax assessment - Interest and Penalties	25			25
Tax and Customs Administration, Netherlands [Member]
Income Tax Contingency [Line Items]
Income tax assessment	95			95
Additional income tax assessment - Interest and Penalties	$ 38			$ 38