Benefit Obligations (Schedule of Weighted Average Target Asset Allocations) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets	13.50%
Expected return on plan assets	6.70%	6.70%	6.80%
Weighted average target asset allocations	100.00%
UNITED STATES | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	80.00%
UNITED STATES | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	10.00%
UNITED STATES | Equity Securities International To Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	10.00%
UNITED STATES | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	0.00%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	5.10%	5.60%	5.90%
Weighted average target asset allocations	100.00%
Foreign Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	57.00%
Foreign Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	16.00%
Foreign Plan [Member] | Equity Securities International To Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	0.00%
Foreign Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	27.00%