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Long-Term Employee Benefits (Defined Contribution Plan) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other Defined Contribution Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution |  | $ 33 | $ 57 | $ 66
Discontinued Operations [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution |  |  | 32 | 57
U.S. Defined Contribution Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution |  | $ 187 | $ 219 | $ 262
US Retirement Savings Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percent of portion of employee's contribution matched by the employer |  | 100.00% |  |
Maximum percent of eligible compensation matched by employer |  | 6.00% |  |
Percent of eligible compensation contributed to defined contribution plan |  | 3.00% |  |
Requisite service period, years |  | 3 years |  |
Scenario, Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan estimated future employer contributions in next fiscal year | about the same |  |  |

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- Definition Amount of employer's best estimate of contributions expected to be paid to the defined contribution plan during the next fiscal year beginning after the date of the latest statement of financial position. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a contribution to a defined contribution plan, regardless of the employee's contribution. + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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