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Financial Instruments - Long-term Debt Maturity (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]              
Long-term debt current portion $ 500   $ 500        
2020 500            
2021 600            
2022 0            
2023 1,350            
2024 0            
After 2024 4,050            
Total long-term debt 6,500   $ 6,500        
Interest expense, net of capitalized interest 53 $ 56          
Capitalized interest $ 4 $ 3          
Senior Notes              
Debt Instrument [Line Items]              
Total long-term debt       $ 1,500 $ 1,250 $ 1,250 $ 3,650