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Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Long-Term Debt    
Finance Lease, Liability $ 166 $ 173
Subtotal 3,675 3,722
Unamortized debt issuance costs [1] (18) (19)
Current installments of long-term debt (525) (527)
Total 3,132 3,176
Senior Unsecured Notes Due 2022    
Long-Term Debt    
Senior unsecured debt $ 500 500
Interest rate 4.625%  
Senior Unsecured Notes Due 2023    
Long-Term Debt    
Senior unsecured debt $ 499 509
Interest rate 1.125%  
Senior Unsecured Notes Due 2024    
Long-Term Debt    
Senior unsecured debt $ 499 499
Interest rate 3.50%  
Senior Unsecured Notes Due 2025    
Long-Term Debt    
Senior unsecured debt $ 332 339
Interest rate 1.25%  
Senior Unsecured Notes Due 2026    
Long-Term Debt    
Senior unsecured debt $ 400 400
Interest rate 1.40%  
Senior Unsecured Notes Due 2027    
Long-Term Debt    
Senior unsecured debt $ 553 564
Interest rate 2.125%  
Senior Unsecured Notes Due 2028    
Long-Term Debt    
Senior unsecured debt $ 555 566
Interest rate 0.625%  
Refunding loan for pollution control and industrial revenue bonds    
Long-Term Debt    
Other long-term debt $ 166 166
Loans Payable    
Long-Term Debt    
Other long-term debt [2] $ 5 $ 6
Long-term Debt, Weighted Average Interest Rate, at Point in Time 1.30% 1.30%
Minimum | Refunding loan for pollution control and industrial revenue bonds    
Long-Term Debt    
Interest rate 4.05%  
Maximum | Refunding loan for pollution control and industrial revenue bonds    
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, 2022 and December 31, 2021, respectively.