Employee Benefit Plans (Details) $ in Millions | 3 Months Ended | 5 Months Ended | 10 Months Ended | 12 Months Ended |
Dec. 31, 2017USD ($) | Mar. 02, 2016USD ($) | Sep. 24, 2016USD ($) | Dec. 31, 2019USD ($) | Dec. 31, 2018USD ($) | Sep. 30, 2017USD ($) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] | | | | | | | |
Long-term pension and postretirement liability | | $ 0 | | | | $ (30) | |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] | | | | | | | |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | | | | | | 203 | |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | | | | | | 201 | |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Fair Value of Plan Assets | | | | | | 175 | |
Multiemployer Plans [Abstract] | | | | | | | |
Multiemployer Plan, Contributions by Employer | | | | | | 2 | |
Defined Contribution Plan [Abstract] | | | | | | | |
Trading Securities, Realized Gain (Loss) | | | | | | (5) | |
Matching and discretionary profit sharing contributions | | 3 | $ 5 | $ 6 | | $ 36 | $ 11 |
US Plan Assets Percentage of All Plans | | | | | | 0.92 | |
US PBO Percentage of All Plans | | | | | | 0.91 | |
Weighted Average [Member] | | | | | | | |
Defined Benefit Plan, Assumptions Used in Calculations [Abstract] | | | | | | | |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate | | | | | | 4.25% | |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | | | | | | 4.25% | |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase | | | | | | 3.00% | |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase | | | | | | 3.00% | |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | | | | | | 5.25% | |
Level 1 | | | | | | | |
Defined Contribution Plan [Abstract] | | | | | | | |
Trading Securities | | | | | | $ 44 | |
Pension Plan [Member] | | | | | | | |
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits [Abstract] | | | | | | | |
Defined Benefit Plan, Benefit Obligation | | | | | | 0 | |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change | | | | | | 222 | |
Defined Benefit Plan, Service Cost | | | | | | 1 | |
Defined Benefit Plan, Interest Cost | | | | | | 5 | |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | | | | | | (7) | |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | | | | | | (1) | |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | | | | | | (1) | |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | | | | | | (13) | |
Defined Benefit Plan, Benefit Obligation | | 0 | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | | | | $ 178 | 0 | |
Defined Benefit Plan, Plan Assets, Business Combination | | | | | | 200 | |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | | | | | | (8) | |
Defined Benefit Plan, Plan Assets, Contributions by Employer | | | | | | 1 | |
Defined Benefit Plan, Plan Assets, Benefits Paid | | | | | | (1) | |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | | | | | | (1) | |
Defined Benefit Plan, Plan Assets, Payment for Settlement | | | | | | (13) | |
Defined Benefit Plan, Fair Value of Plan Assets | | $ 0 | | | | 178 | |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] | | | | | | | |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | | | | | | (28) | |
Liability, Defined Benefit Plan, Current | | | | | | (1) | |
Long-term pension and postretirement liability | | | | | | (27) | |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] | | | | | | | |
Defined Benefit Plan, Service Cost | | | | | | 1 | |
Defined Benefit Plan, Interest Cost | | | | | | 5 | |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | | | | | | (5) | |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | | | | | | 1 | |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] | | | | | | | |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | | | | | | 5 | |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | | | | | | 0 | |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | | | | | | 5 | |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] | | | | | | | |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | | | | | | 11 | |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | | | | | | 11 | |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | | | | | | 12 | |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | | | | | | 12 | |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | | | | | | 13 | |
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | | | | | | 63 | |
Defined Contribution Plan [Abstract] | | | | | | | |
Defined Benefit Plan, Accumulated Benefit Obligation | | | | | | 204 | |
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Level 1 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | | | | 3 | | |
Defined Benefit Plan, Fair Value of Plan Assets | | | | | | 3 | |
Pension Plan [Member] | Domestic Corporate Debt Securities [Member] | Level 2 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | | | | 132 | | |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | | | | | $ 132 | |
Pension Plan [Member] | Fixed Income Securities [Member] | | | | | | | |
Defined Benefit Plan, Assumptions Used in Calculations [Abstract] | | | | | | | |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | | | | | | 80.00% | |
Defined Benefit Plan, Actual Plan Asset Allocations | | | | | | 4.60% | |
Pension Plan [Member] | Equity Securities [Member] | | | | | | | |
Defined Benefit Plan, Assumptions Used in Calculations [Abstract] | | | | | | | |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | | | | | | 20.00% | |
Defined Benefit Plan, Actual Plan Asset Allocations | | | | | | 7.60% | |
Pension Plan [Member] | Foreign Corporate Debt Securities [Member] | Level 2 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2] | | | | 14 | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2] | | | | | $ 14 | |
Pension Plan [Member] | Domestic Plan [Member] | Equity Securities [Member] | Level 2 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2],[3] | | | | 16 | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2],[3] | | | | | 16 | |
Pension Plan [Member] | Domestic Plan [Member] | Funded Plan [Member] | | | | | | | |
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits [Abstract] | | | | | | | |
Defined Benefit Plan, Benefit Obligation | | | | | 206 | | |
Defined Benefit Plan, Benefit Obligation | | | | | | 206 | |
Pension Plan [Member] | Foreign Plan [Member] | Equity Securities [Member] | Level 2 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2],[3] | | | | 13 | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2],[3] | | | | | 13 | |
Other Postretirement Benefits Plan [Member] | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | | | | 6 | | |
Defined Benefit Plan, Fair Value of Plan Assets | | | | | | 6 | |
Other Postretirement Benefits Plan [Member] | Cash and Cash Equivalents [Member] | Level 1 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | | | | 0 | | |
Defined Benefit Plan, Fair Value of Plan Assets | | | | | | 0 | |
Other Postretirement Benefits Plan [Member] | Domestic Corporate Debt Securities [Member] | Level 2 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | | | | 5 | | |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | | | | | 5 | |
Other Postretirement Benefits Plan [Member] | Foreign Corporate Debt Securities [Member] | Level 2 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2] | | | | 0 | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2] | | | | | 0 | |
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member] | Equity Securities [Member] | Level 2 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2],[3] | | | | 1 | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2],[3] | | | | | 1 | |
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member] | Equity Securities [Member] | Level 2 | | | | | | | |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | | | | | | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2],[3] | | | | 0 | | |
Defined Benefit Plan, Fair Value of Plan Assets | [2],[3] | | | | | $ 0 | |
Scenario, Forecast [Member] | | | | | | | |
Defined Contribution Plan [Abstract] | | | | | | | |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | | | | | $ 0 | | |
Central States Largest Plan [Member] | | | | | | | |
Multiemployer Plans [Abstract] | | | | | | | |
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Employer's Participants | | | | | | 56.00% | |
Central States Multiemployer Plan [Member] | | | | | | | |
Multiemployer Plans [Abstract] | | | | | | | |
Entity Tax Identification Number | | | | | | 366,044,243 | |
Multi-employer Plan Expected Future Contrib Y1 | | | | | | $ 1 | |
Multiemployer Plan Number | | | | | | 1 | |
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan | [4] | | | | | Implemented | |
Multiemployer Plans, Certified Zone Status | | | | | | Red | |
Multiemployer Plans, Surcharge | | | | | | Yes | |
Multi-employer Plan Expected Future Contrib Y2 | | | | | | $ 2 | |
Multi-employer Plan Expected Future Contrib Y3 | | | | | | 2 | |
Multi-employer Plan Expected Future Contrib Y4 | | | | | | 2 | |
Multi-employer Plan Expected Future Contrib Y5 | | | | | | 2 | |
Individually Significant Multiemployer plan [Member] | | | | | | | |
Multiemployer Plans [Abstract] | | | | | | | |
Multiemployer Plan, Contributions by Employer | | | | | | 1 | |
Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] | | | | | | | |
Multiemployer Plans [Abstract] | | | | | | | |
Multiemployer Plan, Contributions by Employer | | | | | | $ 1 | |
Central States Plans 2019 Expiration [Member] | | | | | | | |
Multiemployer Plans [Abstract] | | | | | | | |
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Employer's Participants | | | | | | 16.00% | |
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[1] | (3)Fixed income securities are comprised of a diversified portfolio of investment-grade corporate and government securities. Investments are provided by the investment managers using a unit price or NAV based on the fair value of the underlying investments. | |
[2] | (2)The NAV is based on the fair value of the underlying assets owned by the equity index fund or fixed income investment vehicle per share, multiplied by the number of units held as of the measurement date. | |
[3] | (1)Equity securities are comprised of actively managed U.S. index funds and Europe, Australia, Far East index funds. | |
[4] | (1)Central States includes seven collective bargaining agreements. The largest agreement, which is set to expire February 29, 2020, covers approximately 56% of the employees included in Central States. Two of the collective bargaining agreements are set to expire during 2019, covering approximately 16% of the employees included in Central States. | |