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Financing Arrangements - Carrying amount and Fair value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Apr. 12, 2019
Apr. 01, 2019
Financing Arrangements        
Fair value adjustment related to hedged fixed rate debt instruments   $ 1    
Long-term debt, noncurrent $ 1,748 1,766    
Short-term borrowings 58 82    
Total short-term borrowings 438 82    
Total debt, Carrying Amount 2,186 1,848    
Long-term debt, noncurrent, Fair Value 1,751 1,751    
Short-term borrowings, Fair Value 58 82    
Total short-term borrowings, Fair Value 438 82    
Total debt, Fair Value $ 2,189 $ 1,833    
2.9% senior notes due June 1, 2030        
Financing Arrangements        
Debt, interest rate (as a percent) 2.90%      
Long-term debt excluding fair value adjustments $ 594      
Long-term debt, noncurrent, Fair Value $ 596      
3.2% senior notes due October 1, 2026        
Financing Arrangements        
Debt, interest rate (as a percent) 3.20% 3.20%    
Long-term debt excluding fair value adjustments $ 497 $ 497    
Long-term debt, noncurrent, Fair Value $ 500 $ 491    
3.9% senior notes due June 1, 2050        
Financing Arrangements        
Debt, interest rate (as a percent) 3.90%      
Long-term debt excluding fair value adjustments $ 390      
Long-term debt, noncurrent, Fair Value $ 395      
4.625% senior notes due November 1, 2020        
Financing Arrangements        
Debt, interest rate (as a percent) 4.625% 4.625%    
Long-term debt excluding fair value adjustments   $ 400    
Long-term debt, noncurrent, Fair Value   $ 399    
6.625% senior notes due April 15, 2037        
Financing Arrangements        
Debt, interest rate (as a percent) 6.625% 6.625%    
Long-term debt excluding fair value adjustments $ 253 $ 253    
Long-term debt, noncurrent, Fair Value $ 246 $ 246    
5.62% senior notes due March 25, 2020        
Financing Arrangements        
Debt, interest rate (as a percent) 5.62% 5.62%    
Long-term debt excluding fair value adjustments   $ 200    
Long-term debt, noncurrent, Fair Value   200    
Term loan credit agreement due April 25, 2019        
Financing Arrangements        
Long-term debt excluding fair value adjustments       $ 165
Term loan credit agreement due April 12, 2021        
Financing Arrangements        
Long-term debt excluding fair value adjustments   405 $ 500  
Long-term debt, current $ 380      
Long-term debt, noncurrent, Fair Value   405    
Long-term debt, current, Fair Value 380      
Other long-term borrowings        
Financing Arrangements        
Long-term debt excluding fair value adjustments 14      
Long-term debt, noncurrent, Fair Value $ 14      
Revolving credit facility        
Financing Arrangements        
Long-term debt excluding fair value adjustments   10    
Long-term debt, noncurrent, Fair Value   $ 10