Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Contingency [Line Items]
Effective income tax rate	15.90%	(4.30%)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount		$ 73
Argentine Tax Authorities [Member]
Income Tax Contingency [Line Items]
Income tax assessment	$ 9
Income tax assessment - Interest and Penalties	39
Estimated Additional Tax Assessment	66
Additional income tax assessment - Interest and Penalties	28
Tax and Customs Administration, Netherlands [Member]
Income Tax Contingency [Line Items]
Income tax assessment	95
Additional income tax assessment - Interest and Penalties	$ 34