Income Taxes (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) assessment	Dec. 31, 2017 USD ($)	Dec. 31, 2016
Income Taxes [Line Items]
Foreign earnings, as a percentage to total foreign earnings	56.00%	59.00%	47.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)		$ (379)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)		(528)
Tax Cuts and Jobs Act, Decrease in Deferred Tax Liability Due to Transition Tax		220
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit)		(369)
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)	$ 29
Effective income tax rate reconciliation, GILTI, Amount	101
Effective income tax rate reconciliation, FDII, Amount	101
Tax assets related to net operating loss carry-forwards related to certain international subsidiaries	313	254
Deferred Tax Assets, Valuation Allowance	289	264
Tax assets related to net operating loss carry-forwards related to capital losses	55	64
State tax attributes	74	78
Approximate undistributed earnings of foreign subsidiaries and affiliated corporate joint venture companies accounted for on the equity method	10,500
Accrued interest and penalties on unrecognized tax benefits	24	23
Positive impact on the tax expense if the total amount of unrecognized tax benefits were recognized by the Company at one time	107
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Income Taxes [Line Items]
Income tax assessment - Tax	109
Income tax assessment - Interest and Penalties	308
Argentine Tax Authorities [Member]
Income Taxes [Line Items]
Income tax assessment - Tax	17
Income tax assessment - Interest and Penalties	58
Estimated additional tax assessment	52
Additional income tax assessment - Interest and Penalties	58
Foreign [Member]
Income Taxes [Line Items]
Tax assets related to net operating loss carry-forwards related to certain international subsidiaries with no expiration date	221
Tax assets related to net operating loss carry-forwards related to certain international subsidiaries with expiration date	92
Valuation allowance recorded against tax assets related to net operating loss carry-forwards related to certain international subsidiaries	166	134
Tax and Customs Administration, Netherlands [Member]
Income Taxes [Line Items]
Income tax assessment - Tax	93
Additional income tax assessment - Interest and Penalties	$ 31
Tax years 2004, 2006. and 2007 [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Income Taxes [Line Items]
Number of separate tax assessments | assessment	3
SEC Schedule, 12-09, Valuation Allowance, Other Tax Carryforward [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 55	64
SEC Schedule, 12-09, Valuation Allowance, Operating Loss Carryforward [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 68	$ 65