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Benefit Plans (Plan Asset Allocations) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 455,000,000 | $ 402,000,000 | $ 379,000,000
Percentage of Plan Assets | 100.00% | 100.00% |
Foreign Plan [Member] | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocations | 4.00% |  |
Percentage of Plan Assets | 4.61% | 18.66% |
Foreign Plan [Member] | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocations | 93.00% |  |
Percentage of Plan Assets | 93.10% | 78.35% |
Foreign Plan [Member] | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 2,000,000 | $ 3,000,000 |
Target Allocations | 0.00% |  |
Percentage of Plan Assets | 0.44% | 0.75% |
Foreign Plan [Member] | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocations | 3.00% |  |
Percentage of Plan Assets | 1.85% | 2.24% |
UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 1,127,000,000 | $ 1,044,000,000 | $ 1,021,000,000
Percentage of Plan Assets | 100.00% | 100.00% |
UNITED STATES | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocations | 33.00% |  |
Percentage of Plan Assets | 31.90% | 50.96% |
UNITED STATES | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocations | 65.00% |  |
Percentage of Plan Assets | 64.53% | 45.88% |
UNITED STATES | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 36,000,000 | $ 33,000,000 |
Target Allocations | 2.00% |  |
Percentage of Plan Assets | 3.20% | 3.16% |
UNITED STATES | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 4,000,000 | $ 0 |
UNITED STATES | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocations | 0.00% |  |
Percentage of Plan Assets | 0.37% | 0.00% |
Fair Value, Inputs, Level 1 [Member] | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 355,000,000 | $ 300,000,000 |
Fair Value, Inputs, Level 1 [Member] | Foreign Plan [Member] | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1,091,000,000 | 1,011,000,000 |
Fair Value, Inputs, Level 1 [Member] | UNITED STATES | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | UNITED STATES | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 4,000,000 | 0 |
Fair Value, Inputs, Level 2 [Member] | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 90,000,000 | 90,000,000 |
Fair Value, Inputs, Level 2 [Member] | Foreign Plan [Member] | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 36,000,000 | 33,000,000 |
Fair Value, Inputs, Level 2 [Member] | UNITED STATES | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 36,000,000 | 33,000,000 |
Fair Value, Inputs, Level 2 [Member] | UNITED STATES | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 10,000,000 | 12,000,000 |
Fair Value, Inputs, Level 3 [Member] | Foreign Plan [Member] | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 2,000,000 | 3,000,000 |
Fair Value, Inputs, Level 3 [Member] | UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | UNITED STATES | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | UNITED STATES | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 0 | $ 0 |

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