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Financial Instruments (Long-term Debt Maturity) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 600  
2022 0  
2023 1,350  
2024 0  
2025 750  
After 2025 4,550  
Total $ 7,250 $ 6,500