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Financing Arrangements (Summary of Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 5,357 $ 4,699
Other, net (15) (22)
Less current maturities 298 559
Total long-term debt 5,059 4,140
Senior Note - 0.63%, maturing 2020    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 0 561
Stated interest rate 0.63%  
Senior Note - 4.85%, maturing 2021    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 300 300
Stated interest rate 4.85%  
Senior Note - 4.70%, maturing 2022    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 300 300
Stated interest rate 4.70%  
Senior Note - 3.70%, maturing 2023    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 250 250
Stated interest rate 3.70%  
Senior Note - 4.00%, maturing 2024    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 300 300
Stated interest rate 4.00%  
Senior Note - 3.70%, maturing 2025    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 350 350
Stated interest rate 3.70%  
Senior Note - 1.25% Maturing 2026    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 606 556
Stated interest rate 1.25%  
Senior Note - 1.10% Maturing 2027    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 727 667
Stated interest rate 1.10%  
Senior Note - 0.50% Maturing 2028    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 607 0
Stated interest rate 0.50%  
Senior Note - 4.75%, maturing 2029    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 693 692
Stated interest rate 4.75%  
Senior Note - 5.15%, maturing 2043    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 249 249
Stated interest rate 5.15%  
Senior Note - 4.50%, maturing 2046    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 497 496
Stated interest rate 4.50%  
Senior Note - 4.60%, maturing 2050    
Debt Instrument [Line Items]    
Long-term debt, including current maturities $ 493 $ 0
Stated interest rate 4.60%