XML 70 R57.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Assets and Liabilities Measured at Fair Value on a Recurring Basis      
Derivatives $ 7 $ 22  
Derivatives 95 $ 124  
Recurring Basis      
Assets and Liabilities Measured at Fair Value on a Recurring Basis      
Marketable Securities 38   $ 9
Derivatives 7   22
Total Assets at Fair Value 45   31
Derivatives 95   124
Total Liabilities at Fair Value 95   124
Recurring Basis | Level 1      
Assets and Liabilities Measured at Fair Value on a Recurring Basis      
Marketable Securities 38   9
Derivatives 0   0
Total Assets at Fair Value 38   9
Derivatives 64   78
Total Liabilities at Fair Value 64   78
Recurring Basis | Level 2      
Assets and Liabilities Measured at Fair Value on a Recurring Basis      
Marketable Securities 0   0
Derivatives 7   22
Total Assets at Fair Value 7   22
Derivatives 31   46
Total Liabilities at Fair Value 31   46
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