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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets Measured at Fair Value on Recurring Basis
The following tables present our financial assets and financial liabilities that are measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017. We did not have any financial liabilities measured at fair value on a recurring basis as of December 31, 2017.
 
September 30, 2018
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in millions)
Assets at Fair Value
 
 
 
 
 
 
Financial investments, at fair value
$
202

 
$
148

 
$
54

 
$

Default fund and margin deposit investments
1,617

 
215

 
1,402

 

Total Assets at Fair Value
$
1,819

 
$
363

 
$
1,456

 
$

Liabilities at Fair Value
 
 
 
 
 
 
Other financial instruments
$
56

 
$

 
$
56

 
$

Total Liabilities at Fair Value
$
56

 
$

 
$
56

 
$


 
December 31, 2017
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in millions)
Assets at Fair Value
 
 
 
 
 
 
Financial investments, at fair value
$
235

 
$
135

 
$
100

 
$

Default fund and margin deposit investments
2,129

 
371

 
1,758

 

Total Assets at Fair Value
$
2,364

 
$
506

 
$
1,858

 
$