Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Contingency [Line Items]
Effective income tax rate	18.40%	(13.00%)	15.80%	3.40%
Effective Income Tax Rate Reconciliation, Tax Credit, Amount				$ 73
Argentine Tax Authorities [Member]
Income Tax Contingency [Line Items]
Income tax assessment	$ 9		$ 9
Income tax assessment - Interest and Penalties	39		39
Estimated Additional Tax Assessment	62		62
Additional income tax assessment - Interest and Penalties	35		35
Tax and Customs Administration, Netherlands [Member]
Income Tax Contingency [Line Items]
Income tax assessment	94		94
Additional income tax assessment - Interest and Penalties	$ 33		$ 33