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Benefit Plans (Net Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | $ (22) | $ (19) |
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant | 1 | 1 |
CHANGE IN PROJECTED BENEFIT OBLIGATION: |  |  |
Benefit obligation, beginning period | 411 | 374 |
Service cost | 10 | 9 | $ 10
Interest cost | 23 | 21 | 23
Defined Benefit Plan, Benefit Obligation, Interest cost | 22 |  |
Plan amendments | (1) | (4) |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 2 | 0 |
Actuarial loss | (29) | (58) |
Effect of foreign currency exchange rate changes | 22 | (29) |
Benefit obligation, ending period | 470 | 411 | 374
CHANGE IN PLAN ASSETS: |  |  |
Fair value of plan assets, beginning period | 402 | 379 |
Actual return on plan assets | 31 | 59 |
Employer contributions | 18 | 18 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (2) | 0 |
Effect of foreign currency exchange rate changes | 27 | (36) |
Fair value of plan assets, ending period | 455 | 402 | 379
Funded status as of December 31 | (15) | (9) |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant | 1 | 1 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (22) | (19) |
UNITED STATES |  |  |
CHANGE IN PROJECTED BENEFIT OBLIGATION: |  |  |
Benefit obligation, beginning period | 1,188 | 1,172 |
Service cost | 13 | 13 | 16
Interest cost | 41 | 42 | 48
Plan amendments | 1 | 0 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 3 | 2 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 0 | 0 |
Actuarial loss | (82) | (19) |
Effect of foreign currency exchange rate changes | 0 | 0 |
Benefit obligation, ending period | 1,257 | 1,188 | 1,172
CHANGE IN PLAN ASSETS: |  |  |
Fair value of plan assets, beginning period | 1,044 | 1,021 |
Actual return on plan assets | 141 | 61 |
Employer contributions | 13 | 22 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 0 | 0 |
Effect of foreign currency exchange rate changes | 0 | 0 |
Fair value of plan assets, ending period | 1,127 | 1,044 | $ 1,021
Funded status as of December 31 | (130) | (144) |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant | 0 | 0 |
Defined Benefit Plan, Plan Assets, Benefits Paid | $ (71) | $ (60) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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