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Debt - Summary (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
May 17, 2018
Sep. 22, 2016
May 26, 2015
Debt Instrument [Line Items]          
Total debt $ 3,665 $ 3,662      
Less: short-term debt including current maturities 699 0      
Long-term debt 2,966 3,662      
Senior Notes | 3.3% Senior Notes, due 2020          
Debt Instrument [Line Items]          
Total debt $ 699 698      
Stated interest rate (as a percent) 3.30%        
Unamortized debt discount and issuance costs $ 1        
Senior Notes | 4.0% Senior Notes, due 2025          
Debt Instrument [Line Items]          
Total debt $ 694 693      
Stated interest rate (as a percent) 4.00%       4.00%
Unamortized debt discount and issuance costs $ 6        
Senior Notes | 4.4% Senior Notes, due 2026          
Debt Instrument [Line Items]          
Total debt $ 893 892      
Stated interest rate (as a percent) 4.40%        
Unamortized debt discount and issuance costs $ 7        
Senior Notes | 2.95% Senior Notes, due 2027          
Debt Instrument [Line Items]          
Total debt $ 493 493      
Stated interest rate (as a percent) 2.95%     2.95%  
Unamortized debt discount and issuance costs $ 7        
Senior Notes | 6.55% Senior Notes, due 2037          
Debt Instrument [Line Items]          
Total debt $ 396 396      
Stated interest rate (as a percent) 6.55%        
Unamortized debt discount and issuance costs $ 4        
Senior Notes | 4.5% Senior Notes, due 2048          
Debt Instrument [Line Items]          
Total debt $ 490 $ 490      
Stated interest rate (as a percent) 4.50%   4.50%    
Unamortized debt discount and issuance costs $ 10