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Pension Plans and Other Post Employment Benefit Plans Change in Projected Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Benefit obligation at end of the period |  | $ 389 |  | $ 389 |  |  |  |  |
Successor [Member] | Pension Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of the period | [1] |  |  | 26,036 |  |  |  |  |
Service Cost |  |  |  | 49 |  |  |  |  |
Interest Cost |  |  |  | 247 |  |  |  |  |
Plan participants' contributions |  |  |  | 6 |  |  |  |  |
Actuarial (gain) loss |  |  |  | (23) |  |  |  |  |
Benefits Paid |  |  |  | (730) |  |  |  |  |
Plan amendments |  |  |  | 0 |  |  |  |  |
Net effects of acquisitions / divestitures / other |  |  |  | 22 |  |  |  |  |
Effect of foreign exchange rates |  |  |  | (57) |  |  |  |  |
Benefit obligation at end of the period |  | 25,550 |  | 25,550 | $ 26,036 | [1] |  |  |
Fair value of plan assets at beginning of period | [1] |  |  | 20,395 |  |  |  |  |
Actual return on plan assets |  |  |  | 549 |  |  |  |  |
Employer contributions |  |  |  | 68 |  |  |  |  |
Plan participants' contributions |  |  |  | 6 |  |  |  |  |
Benefits paid | [2] |  |  | (730) |  |  |  |  |
Net effects of acquisitions / divestitures / other |  |  |  | 29 |  |  |  |  |
Effect of foreign exchange rates |  |  |  | (33) |  |  |  |  |
Fair value of plan assets at end of the period |  | 20,284 |  | 20,284 | 20,395 | [1] |  |  |
Funded (unfunded) status of plan |  | (5,266) |  | (5,266) |  |  |  |  |
Successor [Member] | Pension Plan | Principal U.S. Pension Plan [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Lump-Sum Payments |  | 140 |  |  |  |  |  |  |
Successor [Member] | Pension Plan | U.S. Plans with Plan Assets [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  | (3,628) |  | (3,628) |  |  |  |  |
Successor [Member] | Pension Plan | Non-U.S. plans with plan assets [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  | (447) |  | (447) |  |  |  |  |
Successor [Member] | Pension Plan | All other plans [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan | [3],[4] | (1,191) |  | (1,191) |  |  |  |  |
Successor [Member] | Pension Plan | Plans of Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  | 0 |  | 0 |  |  |  |  |
Successor [Member] | Other Post Employment Benefits Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of the period | [1] |  |  | 2,772 |  |  |  |  |
Service Cost |  |  |  | 3 |  |  |  |  |
Interest Cost |  |  |  | 26 |  |  |  |  |
Plan participants' contributions |  |  |  | 12 |  |  |  |  |
Actuarial (gain) loss |  |  |  | 68 |  |  |  |  |
Benefits Paid |  |  |  | (71) |  |  |  |  |
Plan amendments |  |  |  | 0 |  |  |  |  |
Net effects of acquisitions / divestitures / other |  |  |  | 0 |  |  |  |  |
Effect of foreign exchange rates |  |  |  | 0 |  |  |  |  |
Benefit obligation at end of the period |  | 2,810 |  | 2,810 | 2,772 | [1] |  |  |
Fair value of plan assets at beginning of period | [1] |  |  | 0 |  |  |  |  |
Actual return on plan assets |  |  |  | 0 |  |  |  |  |
Employer contributions |  |  |  | 59 |  |  |  |  |
Plan participants' contributions |  |  |  | 12 |  |  |  |  |
Benefits paid |  |  |  | (71) |  |  |  |  |
Net effects of acquisitions / divestitures / other |  |  |  | 0 |  |  |  |  |
Effect of foreign exchange rates |  |  |  | 0 |  |  |  |  |
Fair value of plan assets at end of the period |  | 0 |  | 0 | 0 | [1] |  |  |
Funded (unfunded) status of plan |  | (2,810) |  | (2,810) |  |  |  |  |
Successor [Member] | Other Post Employment Benefits Plan | U.S. Plans with Plan Assets [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  | 0 |  | 0 |  |  |  |  |
Successor [Member] | Other Post Employment Benefits Plan | Non-U.S. plans with plan assets [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  | 0 |  | 0 |  |  |  |  |
Successor [Member] | Other Post Employment Benefits Plan | All other plans [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  | (2,810) |  | (2,810) |  |  |  |  |
Successor [Member] | Other Post Employment Benefits Plan | Plans of Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  | $ 0 |  | 0 |  |  |  |  |
Predecessor [Member] | Pension Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of the period |  |  |  | 24,766 | 24,831 |  | $ 26,094 |  |
Service Cost |  |  |  |  | 92 |  | 174 |  | $ 232
Interest Cost |  |  |  |  | 524 |  | 800 |  | 1,084
Plan participants' contributions |  |  |  |  | 8 |  | 18 |  |
Actuarial (gain) loss |  |  |  |  | 0 |  | 460 |  |
Benefits Paid |  |  |  |  | (1,118) |  | (2,374) |  |
Plan amendments |  |  |  |  | 0 |  | 0 |  |
Net effects of acquisitions / divestitures / other |  |  |  |  | 0 |  | 7 |  |
Effect of foreign exchange rates |  |  |  |  | 429 |  | (348) |  |
Benefit obligation at end of the period |  |  | $ 24,831 |  | 24,766 |  | 24,831 |  | 26,094
Fair value of plan assets at beginning of period |  |  |  | 19,685 | 16,656 |  | 17,497 |  |
Actual return on plan assets |  |  |  |  | 846 |  | 1,219 |  |
Employer contributions |  |  |  |  | 3,024 |  | 535 |  |
Plan participants' contributions |  |  |  |  | 8 |  | 18 |  |
Benefits paid |  |  |  |  | (1,118) |  | (2,374) | [2] |
Net effects of acquisitions / divestitures / other |  |  |  |  | 0 |  | 0 |  |
Effect of foreign exchange rates |  |  |  |  | 269 |  | (239) |  |
Fair value of plan assets at end of the period |  |  | 16,656 |  | 19,685 |  | 16,656 |  | 17,497
Funded (unfunded) status of plan |  |  | (8,175) |  | (5,081) |  | (8,175) |  |
Predecessor [Member] | Pension Plan | Principal U.S. Pension Plan [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  | 2,900 |  | 230 |  |
Lump-Sum Payments |  |  | 550 |  |  |  |  |  |
Predecessor [Member] | Pension Plan | U.S. Plans with Plan Assets [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  |  | (6,391) |  | (3,277) |  | (6,391) |  |
Predecessor [Member] | Pension Plan | Non-U.S. plans with plan assets [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  |  | (674) |  | (609) |  | (674) |  |
Predecessor [Member] | Pension Plan | All other plans [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  |  | (1,102) |  | (1,187) |  | (1,102) |  |
Predecessor [Member] | Pension Plan | Plans of Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  |  | (8) |  | (8) |  | (8) |  |
Predecessor [Member] | Other Post Employment Benefits Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of the period |  |  |  | 2,731 | 2,829 |  | 2,758 |  |
Service Cost |  |  |  |  | 6 |  | 11 |  | 15
Interest Cost |  |  |  |  | 60 |  | 87 |  | 112
Plan participants' contributions |  |  |  |  | 26 |  | 36 |  |
Actuarial (gain) loss |  |  |  |  | 0 |  | 153 |  |
Benefits Paid |  |  |  |  | (192) |  | (254) |  |
Plan amendments |  |  |  |  | 0 |  | (28) |  |
Net effects of acquisitions / divestitures / other |  |  |  |  | 0 |  | 65 |  |
Effect of foreign exchange rates |  |  |  |  | 2 |  | 1 |  |
Benefit obligation at end of the period |  |  | 2,829 |  | 2,731 |  | 2,829 |  | 2,758
Fair value of plan assets at beginning of period |  |  |  | $ 0 | 0 |  | 0 |  |
Actual return on plan assets |  |  |  |  | 0 |  | 0 |  |
Employer contributions |  |  |  |  | 166 |  | 218 |  |
Plan participants' contributions |  |  |  |  | 26 |  | 36 |  |
Benefits paid |  |  |  |  | (192) |  | (254) |  |
Net effects of acquisitions / divestitures / other |  |  |  |  | 0 |  | 0 |  |
Effect of foreign exchange rates |  |  |  |  | 0 |  | 0 |  |
Fair value of plan assets at end of the period |  |  | 0 |  | 0 |  | 0 |  | $ 0
Funded (unfunded) status of plan |  |  | (2,829) |  | (2,731) |  | (2,829) |  |
Predecessor [Member] | Other Post Employment Benefits Plan | U.S. Plans with Plan Assets [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  |  | 0 |  | 0 |  | 0 |  |
Predecessor [Member] | Other Post Employment Benefits Plan | Non-U.S. plans with plan assets [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  |  | 0 |  | 0 |  | 0 |  |
Predecessor [Member] | Other Post Employment Benefits Plan | All other plans [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  |  | (2,829) |  | (2,731) |  | (2,829) |  |
Predecessor [Member] | Other Post Employment Benefits Plan | Plans of Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Funded (unfunded) status of plan |  |  | $ 0 |  | $ 0 |  | $ 0 |  |
[1] | The benefit obligation and the fair value of plan assets at the beginning of the period September 1 through December 31, 2017, reflects the remeasurement of the plans at the Merger Effectiveness Time.
[2] | In the fourth quarter of 2016, about $550 million of lump-sum payments were made from the principal U.S. pension plan trust fund to a group of separated, vested plan participants who were extended a limited-time opportunity and voluntarily elected to receive their pension benefits in a single lump-sum payment. In the fourth quarter of 2017, about $140 million of lump-sum payments were made from the principal U.S. pension plan trust fund under a similar program.
[3] | As of December 31, 2017, $389 million of the benefit obligations are supported by funding under the Trust agreement, defined in the "Trust Assets" section below.
[4] | Includes pension plans maintained around the world where funding is not customary.

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- Definition Defined Benefit Plan, Business Combinations And Acquisitions And Divestitures, Plan Assets + References No definition available. + Details
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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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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: 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=82843861&loc=d3e1928-114920 Reference 4: 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=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new 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)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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