Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Contingency [Line Items]
Effective income tax rate	13.70%	14.50%	14.80%	6.90%
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	64		64
Additional income tax assessment - Interest and Penalties	30		30
Tax and Customs Administration, Netherlands [Member]
Income Tax Contingency [Line Items]
Income tax assessment	96		96
Additional income tax assessment - Interest and Penalties	$ 34		$ 34