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Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Long-Term Debt    
Finance Lease, Liability $ 179 $ 201
Subtotal 3,772 3,671
Unamortized debt issuance costs [1] (20) (13)
Current installments of long-term debt (28) (431)
Total 3,724 3,227
Senior Unsecured Notes Due 2021 [Member]    
Long-Term Debt    
Senior unsecured debt $ 0 400
Interest rate 5.875%  
Senior Unsecured Notes Due 2022 [Member]    
Long-Term Debt    
Senior unsecured debt $ 500 500
Interest rate 4.625%  
Senior Unsecured Notes Due 2023 [Member]    
Long-Term Debt    
Senior unsecured debt $ 521 919
Interest rate 1.125%  
Senior Unsecured Notes Due 2024 [Member]    
Long-Term Debt    
Senior unsecured debt $ 499 499
Interest rate 3.50%  
Senior Unsecured Notes Due 2025 [Member]    
Long-Term Debt    
Senior unsecured debt $ 347 368
Interest rate 1.25%  
Senior Unsecured Notes Due 2027 [Member]    
Long-Term Debt    
Senior unsecured debt $ 576 610
Interest rate 2.125%  
Refunding loan for pollution control and industrial revenue bonds [Member]    
Long-Term Debt    
Other long-term debt $ 166 $ 166
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] $ 6 $ 8
Senior Unsecured Notes Due 2026    
Long-Term Debt    
Senior unsecured debt $ 400 0
Interest rate 1.40%  
Senior Unsecured Notes Due 2028    
Long-Term Debt    
Senior unsecured debt $ 578 $ 0
Interest rate 0.625%  
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 September 30, 2021 and December 31, 2020, respectively.