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Financial Instruments (Long-term Debt Maturity) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 $ 500  
2020 600  
2021 0  
2022 1,350  
2023 0  
After 2023 4,050  
Total $ 6,500 $ 6,500