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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]      
Derivatives $ 7 $ 22  
Derivatives 184 $ 124  
Recurring Basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]      
Marketable Securities 58   $ 9
Derivatives 7   22
Total Assets at Fair Value 65   31
Derivatives 184   124
Total Liabilities at Fair Value 184   124
Recurring Basis | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]      
Marketable Securities 58   9
Derivatives 1   0
Total Assets at Fair Value 59   9
Derivatives 117   78
Total Liabilities at Fair Value 117   78
Recurring Basis | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]      
Marketable Securities 0   0
Derivatives 6   22
Total Assets at Fair Value 6   22
Derivatives 67   46
Total Liabilities at Fair Value 67   46
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