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Retirement and Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 08, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net Periodic Benefit Costs |  |  |  |  |
Accumulated other comprehensive income eliminated in purchase price accounting | $ 390 |  |  |  |
Pension Benefit |  |  |  |  |
Net Periodic Benefit Costs |  |  |  |  |
Increase in benefit obligation from remeasurement | $ 193 |  |  |  |
Curtailment gain |  | $ 34 |  | $ 10 |
Net periodic benefit cost |  | 15 | $ 2 | 19 | $ 4
Employer contributions |  | 7 | 2 | 8 | 4
Postretirement Benefit |  |  |  |  |
Net Periodic Benefit Costs |  |  |  |  |
Net periodic benefit cost |  | $ 19 | $ 15 | $ 48 | $ 55

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- Definition Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss) + References No definition available. + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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