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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Derivatives $ 10 $ 32
Derivatives 147 109
Recurring Basis    
Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Marketable Securities 13 13
Derivatives 10 32
Total Assets at Fair Value 23 45
Derivatives 147 109
Total Liabilities at Fair Value 147 109
Recurring Basis | Level 1    
Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Marketable Securities 13 13
Derivatives 1 15
Total Assets at Fair Value 14 28
Derivatives 130 78
Total Liabilities at Fair Value 130 78
Recurring Basis | Level 2    
Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Marketable Securities 0 0
Derivatives 9 17
Total Assets at Fair Value 9 17
Derivatives 17 31
Total Liabilities at Fair Value 17 31
Recurring Basis | Level 3    
Assets and Liabilities Measured at Fair Value on a Recurring Basis    
Marketable Securities 0 0
Derivatives 0 0
Total Assets at Fair Value 0 0
Derivatives 0 0
Total Liabilities at Fair Value $ 0 $ 0