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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%