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Pension Plans and Other Post Employment Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2016 | Aug. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Other Post Employment Benefit Plans |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Weighted Average Discount Rate |  | 3.62% |  |  | 3.62% |  | 4.03% | 3.55% | 4.30%
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  | $ 33 |  |  |
Defined Benefit Plan, Re-measurement Impact, Benefit Obligation |  |  |  |  |  | 265 |  |  |
Predecessor | United States Pension Plan of US Entity [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Contributions by Employer |  |  |  |  | $ 2,900 |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  | (63) |  |  |
Predecessor | Pension Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Weighted Average Discount Rate |  | 3.42% |  |  | 3.42% |  | 3.80% | 3.74% | 4.47%
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  | $ 0 |  | $ 1 | $ 0 | (65) |  |  |
Defined Benefit Plan Re-measurement Impact, Underfunded Status |  |  |  |  |  | 2,352 |  |  |
Settlement loss |  | $ 0 |  | 22 | 0 | 60 |  |  |
Expected Return on Plan Assets | 6.25% | 8.00% |  |  |  |  |  |  |
Predecessor | Other Post Employment Benefit Plans |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  | $ 0 |  | 0 | $ 0 | 33 |  |  |
Successor | All Other Plans [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Contributions by Employer | $ 19 |  |  |  |  |  |  |  |
Successor | Pension Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments | 0 |  |  |  |  |  |  |  |
Defined Benefit Plan Re-measurement Impact, Underfunded Status | 596 |  |  |  |  |  |  |  |
Settlement loss | 0 |  |  |  |  |  |  |  |
Successor | Other Post Employment Benefit Plans |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments | 0 |  |  |  |  |  |  |  |
Defined Benefit Plan, Re-measurement Impact, Benefit Obligation | $ 41 |  |  |  |  |  |  |  |
Scenario, Forecast [Member] | Pension Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Expected Future Contributions, Remainder of Fiscal Year |  |  | $ 50 |  |  |  |  |  |
Pension Restoration Plan [Member] | Predecessor | Pension Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Settlement loss |  |  |  | $ 15 |  | $ 51 |  |  |

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- Definition Re-measurement impact on the other long-term employee benefit obligation. + References No definition available. + Details
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- Definition Re-measurement impact on the underfunded status of the principal U.S. pension plan. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of contributions made by the employer to defined benefit plans. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + 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 The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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