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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 |

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