Benefit Plans (Plan Asset Allocations) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 410,000,000	$ 455,000,000	$ 402,000,000
Percentage of Plan Assets	100.00%	100.00%
Foreign Plan [Member] | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	3.00%
Percentage of Plan Assets	3.75%	4.61%
Foreign Plan [Member] | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	94.00%
Percentage of Plan Assets	93.57%	93.10%
Foreign Plan [Member] | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 2,000,000	$ 2,000,000
Target Allocations	0.00%
Percentage of Plan Assets	0.44%	0.44%
Foreign Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 2,000,000	$ 0
Foreign Plan [Member] | Other
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	3.00%
Percentage of Plan Assets	2.24%	1.85%
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 1,026,000,000	$ 1,127,000,000	$ 1,044,000,000
Percentage of Plan Assets	100.00%	100.00%
UNITED STATES | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	20.00%
Percentage of Plan Assets	16.85%	31.90%
UNITED STATES | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	78.00%
Percentage of Plan Assets	80.20%	64.53%
UNITED STATES | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 24,000,000	$ 36,000,000
Target Allocations	2.00%
Percentage of Plan Assets	2.35%	3.20%
UNITED STATES | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 6,000,000	$ 4,000,000
UNITED STATES | Other
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	0.00%
Percentage of Plan Assets	0.60%	0.37%
Fair Value, Inputs, Level 1 [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 317,000,000	$ 355,000,000
Fair Value, Inputs, Level 1 [Member] | Foreign Plan [Member] | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 1 [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,000,000	0
Fair Value, Inputs, Level 1 [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,002,000,000	1,091,000,000
Fair Value, Inputs, Level 1 [Member] | UNITED STATES | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 1 [Member] | UNITED STATES | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	6,000,000	4,000,000
Fair Value, Inputs, Level 2 [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	84,000,000	90,000,000
Fair Value, Inputs, Level 2 [Member] | Foreign Plan [Member] | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 2 [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 2 [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	24,000,000	36,000,000
Fair Value, Inputs, Level 2 [Member] | UNITED STATES | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	24,000,000	36,000,000
Fair Value, Inputs, Level 2 [Member] | UNITED STATES | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 3 [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9,000,000	10,000,000
Fair Value, Inputs, Level 3 [Member] | Foreign Plan [Member] | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,000,000	2,000,000
Fair Value, Inputs, Level 3 [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 3 [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 3 [Member] | UNITED STATES | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value, Inputs, Level 3 [Member] | UNITED STATES | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0	$ 0