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Financial Instruments - Schedule of Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Aug. 20, 2018
Sep. 12, 2017
Nov. 13, 2015
Jan. 28, 2013
Debt Instrument [Line Items]              
Total long-term debt $ 6,500   $ 6,500        
Unamortized debt discount / debt issuance costs (49)   (51)        
Long-term debt, net of discount and issuance costs 5,963   5,947        
Interest expense, net of capitalized interest 53 $ 56          
Capitalized interest 4 $ 3          
Long-term debt current portion 500   500        
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 12   (2)        
Senior Notes              
Debt Instrument [Line Items]              
Total long-term debt       $ 1,500 $ 1,250 $ 1,250 $ 3,650
Senior Notes | 3.450% 2015 senior notes due 2020              
Debt Instrument [Line Items]              
Total long-term debt 500   500        
Senior Notes | 2018 floating senior notes due 2021              
Debt Instrument [Line Items]              
Total long-term debt 300   300        
Senior Notes | 3.250% 2018 senior notes due 2021              
Debt Instrument [Line Items]              
Total long-term debt 300   300        
Senior Notes | 3.250% 2013 senior notes due 2023              
Debt Instrument [Line Items]              
Total long-term debt 1,350   1,350        
Senior Notes | 4.500% 2015 senior notes due 2025              
Debt Instrument [Line Items]              
Total long-term debt 750   750        
Senior Notes | 3.000% 2017 senior notes due 2027              
Debt Instrument [Line Items]              
Total long-term debt 750   750        
Senior Notes | 3.900% 2018 senior notes due 2028              
Debt Instrument [Line Items]              
Total long-term debt 500   500        
Senior Notes | 4.700% 2013 senior notes due 2043              
Debt Instrument [Line Items]              
Total long-term debt 1,150   1,150        
Senior Notes | 3.950% 2017 senior notes due 2047              
Debt Instrument [Line Items]              
Total long-term debt 500   500        
Senior Notes | 4.450% 2018 senior notes due 2048              
Debt Instrument [Line Items]              
Total long-term debt $ 400   $ 400