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Financing Arrangements (Summary of Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt $ 4,436 $ 3,978
Less current maturities 560 508
Total long-term debt 3,876 3,470
Senior note - 6.5%, matured 2016    
Debt Instrument [Line Items]    
Long-term Debt 0 $ 250
Stated interest rate   6.50%
Debentures - 7.75%, matured 2016    
Debt Instrument [Line Items]    
Long-term Debt 0 $ 244
Stated interest rate   7.75%
Senior note - 1.35%, maturing 2017    
Debt Instrument [Line Items]    
Long-term Debt $ 250 $ 250
Stated interest rate 1.35% 1.35%
Senior note - 1.65%, maturing 2017    
Debt Instrument [Line Items]    
Long-term Debt $ 300 $ 300
Stated interest rate 1.65% 1.65%
Senior note - 4.5%, maturing 2018    
Debt Instrument [Line Items]    
Long-term Debt $ 327 $ 345
Stated interest rate 4.50% 4.50%
Senior note - 2.4%, maturing 2019    
Debt Instrument [Line Items]    
Long-term Debt $ 250 $ 250
Stated interest rate 2.40% 2.40%
Senior note - 0.625% maturing 2020    
Debt Instrument [Line Items]    
Long-term Debt $ 525 $ 541
Stated interest rate 0.625% 0.625%
Senior note - 4.85%, maturing 2021    
Debt Instrument [Line Items]    
Long-term Debt $ 300 $ 300
Stated interest rate 4.85% 4.85%
Senior note - 4.70%, maturing 2022    
Debt Instrument [Line Items]    
Long-term Debt $ 300 $ 300
Stated interest rate 4.70% 4.70%
Senior note - 3.70%, maturing 2023    
Debt Instrument [Line Items]    
Long-term Debt $ 250 $ 250
Stated interest rate 3.70% 3.70%
Senior note - 4.0%, maturing 2024    
Debt Instrument [Line Items]    
Long-term Debt $ 300 $ 300
Stated interest rate 4.00% 4.00%
Senior note - 3.7%, maturing 2025    
Debt Instrument [Line Items]    
Long-term Debt $ 350 $ 350
Stated interest rate 3.70% 3.70%
Senior note - 1.25% maturing 2026    
Debt Instrument [Line Items]    
Long-term Debt $ 517 $ 0
Stated interest rate 1.25%  
Senior note - 5.15% maturing 2043    
Debt Instrument [Line Items]    
Long-term Debt $ 249 $ 249
Stated interest rate 5.15% 5.15%
Senior note - 4.50% maturing 2046    
Debt Instrument [Line Items]    
Long-term Debt $ 496 $ 0
Stated interest rate 4.50%  
Other    
Debt Instrument [Line Items]    
Long-term Debt $ 22 $ 49