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Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Long-Term Debt    
Finance Lease, Liability $ 132 $ 144
Subtotal 3,400 3,455
Unamortized debt issuance costs [1] (18) (18)
Current installments of long-term debt (26) (28)
Total 3,356 3,409
Senior Unsecured Notes Due 2021 [Member]    
Long-Term Debt    
Senior unsecured debt $ 400 400
Interest rate 5.875%  
Date of maturity Jun. 15, 2021  
Senior Unsecured Notes Due 2022 [Member]    
Long-Term Debt    
Senior unsecured debt $ 500 500
Interest rate 4.625%  
Date of maturity Nov. 15, 2022  
Senior Unsecured Notes Due 2023 [Member]    
Long-Term Debt    
Senior unsecured debt $ 821 841
Interest rate 1.125%  
Date of maturity Sep. 26, 2023  
Senior Unsecured Notes Due 2024 [Member]    
Long-Term Debt    
Senior unsecured debt $ 499 499
Interest rate 3.50%  
Date of maturity May 08, 2024  
Senior Unsecured Notes Due 2025 [Member]    
Long-Term Debt    
Senior unsecured debt $ 329 337
Interest rate 1.25%  
Date of maturity Dec. 11, 2025  
Senior Unsecured Notes Due 2027 [Member]    
Long-Term Debt    
Senior unsecured debt $ 544 558
Interest rate 2.125%  
Date of maturity Mar. 01, 2027  
Refunding loan for pollution control and industrial revenue bonds [Member]    
Long-Term Debt    
Other long-term debt $ 167 $ 167
Date of maturity Dec. 31, 2030  
Loans Payable [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 [2] $ 8 $ 9
Date of maturity Dec. 31, 2026  
Obligations Under Capital Leases [Member]    
Long-Term Debt    
Date of maturity Dec. 31, 2054  
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]
Related to the Company's long-term debt, excluding obligations under finance leases.
[2]
The weighted average interest rate was 1.3% and 1.3% as of March 31, 2020 and December 31, 2019, respectively.