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Fair Value Measurements (Details1) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Derivatives $ 2 $ 283
Derivatives 45 12
Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Marketable Securities 58 53
Derivatives 2 283
Total Assets at Fair Value 60 336
Derivatives 45 12
Total Liabilities at Fair Value 45 12
Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Marketable Securities 58 53
Derivatives 0 185
Total Assets at Fair Value 58 238
Derivatives 27 0
Total Liabilities at Fair Value 27 0
Recurring Basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Marketable Securities 0 0
Derivatives 2 98
Total Assets at Fair Value 2 98
Derivatives 18 12
Total Liabilities at Fair Value 18 12
Recurring Basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Marketable Securities 0 0
Derivatives 0 0
Total Assets at Fair Value 0 0
Derivatives 0 0
Total Liabilities at Fair Value $ 0 $ 0