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Retirement Plans and Post Retirement Benefits Funded Status, Assumptions Used in Benefit Obligations and Amounts Recognized in Balance Sheets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in Benefit Obligation [Roll Forward] |  |  |
Beginning of year balance | $ 312 | $ 297 |
Service cost | 1 | 3 | $ 3
Interest cost | 9 | 12 | 11
Actuarial (gain)/loss | 17 | 24 |
Foreign exchange rate changes | 1 | 2 |
Benefits Paid | 21 | 26 |
End of year balance | 319 | 312 | 297
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 294 | 275 |
Actual return on plan assets | 35 | 39 |
Employer contribution | 0 | 4 |
Foreign exchange rate changes | 2 | 3 |
Fair value of plan assets, end of year balance | 310 | 294 | 275
Funded status | (10) | (18) |
Amounts Recognized in Balance Sheet [Abstract] |  |  |
Noncurrent pension assets, included in “Other assets” | 7 | 5 |
Current pension liabilities, included in “Accounts payable and accrued liabilities” | 0 | 0 |
Noncurrent pension liabilities, included in “Other long-term liabilities” | (17) | (23) |
Benefits Expected to be Paid from Benefit Plans [Abstract] |  |  |
2021 | 26 |  |
2022 | 19 |  |
2023 | 20 |  |
2024 | 19 |  |
2025 | 19 |  |
2026– 2030 | 91 |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | 21 | 26 |
Multi-strategy Funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 53 |  |
Fair value of plan assets, end of year balance | 48 | 53 |
Domestic stock funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 54 |  |
Fair value of plan assets, end of year balance | 56 | 54 |
International stock funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 40 |  |
Fair value of plan assets, end of year balance | 46 | 40 |
Domestic bond funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 93 |  |
Fair value of plan assets, end of year balance | 94 | 93 |
Significant Unobservable Inputs (Level 3) |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Domestic stock funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Significant Unobservable Inputs (Level 3) | International stock funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Domestic bond funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 156 |  |
Fair value of plan assets, end of year balance | 167 | 156 |
Fair Value, Inputs, Level 1 [Member] | Multi-strategy Funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 47 |  |
Fair value of plan assets, end of year balance | 48 | 47 |
Fair Value, Inputs, Level 1 [Member] | Domestic stock funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 54 |  |
Fair value of plan assets, end of year balance | 56 | 54 |
Fair Value, Inputs, Level 1 [Member] | International stock funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 40 |  |
Fair value of plan assets, end of year balance | 46 | 40 |
Fair Value, Inputs, Level 1 [Member] | Domestic bond funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 15 |  |
Fair value of plan assets, end of year balance | 17 | 15 |
Fair Value, Inputs, Level 2 |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 22 |  |
Fair value of plan assets, end of year balance | 28 | 22 |
Fair Value, Inputs, Level 2 | Multi-strategy Funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Fair Value, Inputs, Level 2 | Domestic stock funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Fair Value, Inputs, Level 2 | International stock funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Fair Value, Inputs, Level 2 | Domestic bond funds |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 | 0 |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |
Amounts recognized in other comprehensive income—pre-tax |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 | 0 |
Reclassification from accumulated other comprehensive income, current period, before tax | 0 | (1) |
Total | (8) | (8) | (7)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Amounts recognized in other comprehensive income—pre-tax |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 4 | 0 |
Reclassification from accumulated other comprehensive income, current period, before tax | 6 | 4 |
Total | (109) | (119) | (123)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |
Amounts recognized in other comprehensive income—pre-tax |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 4 | 0 |
Reclassification from accumulated other comprehensive income, current period, before tax | 6 | 5 |
Total | (101) | (111) | $ (116)
Defined Benefit, US Plans [Member] |  |  |
Change in Benefit Obligation [Roll Forward] |  |  |
Beginning of year balance | 258 |  |
End of year balance | 262 | 258 |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 236 |  |
Fair value of plan assets, end of year balance | 246 | 236 |
Funded status | $ (16) | $ (22) |
Weighted average assumptions for obligations as of measurement date [Abstract] |  |  |
Discount rate | 2.30% | 3.10% |
Defined Benefit, Canadian Plans [Member] |  |  |
Change in Benefit Obligation [Roll Forward] |  |  |
Beginning of year balance | $ 54 |  |
End of year balance | 58 | $ 54 |
Change in Assets (Fair Value) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 58 |  |
Fair value of plan assets, end of year balance | 64 | 58 |
Funded status | $ 6 | $ 4 |
Weighted average assumptions for obligations as of measurement date [Abstract] |  |  |
Discount rate | 2.30% | 3.00% |
Rate of compensation increase |  | 3.50% |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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