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Fair Value Measurements (Details1) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Derivatives $ 52 $ 283
Derivatives 21 12
Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Marketable Securities 58 53
Derivatives 52 283
Total Assets at Fair Value 110 336
Derivatives 21 12
Total Liabilities at Fair Value 21 12
Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Marketable Securities 58 53
Derivatives 31 185
Total Assets at Fair Value 89 238
Derivatives 14 0
Total Liabilities at Fair Value 14 0
Recurring Basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Marketable Securities 0 0
Derivatives 21 98
Total Assets at Fair Value 21 98
Derivatives 7 12
Total Liabilities at Fair Value 7 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