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Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
May 08, 2019
Long-Term Debt      
Finance Lease, Liability $ 201 $ 144  
Subtotal 3,671 3,455  
Current installments of long-term debt (431) (28)  
Total $ 3,227 3,409  
Debt Instrument, Redemption Price, Percentage 100.00%    
Senior Unsecured Notes Due 2024 [Member]      
Long-Term Debt      
Senior unsecured notes $ 919 841  
Interest Rate 3.50%    
Long-term Debt, Gross     $ 500
Percentage of Face     99.895%
Senior Unsecured Notes Due 2021 [Member]      
Long-Term Debt      
Senior unsecured notes $ 400 400  
Interest Rate 5.875%    
Senior Unsecured Notes Due 2022 [Member]      
Long-Term Debt      
Senior unsecured notes $ 500 500  
Interest Rate 4.625%    
Senior Unsecured Notes Due 2023 [Member]      
Long-Term Debt      
Senior unsecured notes $ 499 499  
Interest Rate 1.125%    
Senior Unsecured Notes Due 2025 [Member]      
Long-Term Debt      
Senior unsecured notes $ 368 337  
Interest Rate 1.25%    
Senior Unsecured Notes Due 2027 [Member]      
Long-Term Debt      
Senior unsecured notes $ 610 558  
Interest Rate 2.125%    
Pollution control and industrial revenue bonds due at various dates through 2030, interest rates ranging from 4.05% to 5.00% [Member]      
Long-Term Debt      
Other Long-term debt $ 166 $ 167  
Nilit bank loans due at various dates through 2026 (Note 4) [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Weighted Average Interest Rate, at Point in Time 1.30% 1.30%  
Long-Term Debt      
Other Long-term debt [1] $ 8 $ 9  
Long-term Debt [Member]      
Long-Term Debt      
Unamortized debt issuance costs [2] $ (13) $ (18)  
Minimum [Member] | Refunding loan for pollution control and industrial revenue bonds [Member]      
Long-Term Debt      
Interest Rate 4.05%    
Maximum [Member] | Refunding loan for pollution control and industrial revenue bonds [Member]      
Long-Term Debt      
Interest Rate 5.00%    
[1] The weighted average interest rate was 1.3% and 1.3% as of December 31, 2020 and 2019, respectively.
[2] Related to the Company's long-term debt, excluding obligations under finance leases.